Identification of ions and gases — Paper 1 · IGCSE Sciences - Co-ordinated (Double) 0654

20 Dilute sulphuric acid is added to antacid tablets in the apparatus shown. dilute sulphuric acid limewater antacid tablets The limewater turns milky. What do the antacid tablets contain? A magnesium B magnesium carbonate C magnesium hydroxide D magnesium oxide

1 marks

Answer: B

This question in 0654/11 May/June 2005

27 Which ion gives a white precipitate both with aqueous sodium hydroxide and with aqueous ammonia? A Cu2+(aq) B Fe2+(aq) C Fe3+(aq) D Zn2+(aq)

1 marks

Answer: D

This question in 0654/11 May/June 2005

15 Heating a metal compound in a Bunsen flame turns the flame green. Which metal ion is present in the compound? A calcium B copper C potassium D sodium

1 marks

Answer: B

This question in 0654/11 May/June 2006

23 A small amount of ammonia is present in a sample of hydrogen. What would be the results of tests on the mixture? damp blue litmus lighted splint A stays blue no effect B stays blue pops C turns red no effect D turns red pops

1 marks

Answer: B

This question in 0654/11 Oct/Nov 2006

20 Glucose gives a red precipitate when tested with reagent X. Cellulose, a protein and starch are broken down into their monomers. Which of these monomers also give a red precipitate when tested with reagent X? cellulose protein starch 0 OO DW > ~*~ KOM Kk 4 \ 4 x

1 marks

Answer: C

This question in 0654/11 Oct/Nov 2007

21 A reagent in solution is added to a solid sample of a fertiliser. The mixture is warmed and the gas given off changes the colour of damp litmus paper. The test shows that the fertiliser contains ammonium ions. What is the reagent and what is the original colour of the litmus paper used in the test? reagent colour of litmus paper A acid blue B acid red C alkali blue D alkali red

1 marks

Answer: D

This question in 0654/11 Oct/Nov 2007

26 In separate experiments, an inert wire is dipped into two solutions, P and Q. The wire is then placed in the flame of a Bunsen burner. glass rod inert wire The table shows the results. solution P solution Q colour of Bunsen flame green yellow Which metal ions are present in the solutions? P Q A copper potassium B copper sodium C sodium copper D sodium potassium

1 marks

Answer: B

This question in 0654/11 Oct/Nov 2007

27 A student tests two solutions. One solution is an aqueous copper salt. The other is an aqueous sodium salt. How can the colours of the solutions and of flame tests show which solution is which? colour of solution colour of flame copper sodium copper sodium A blue colourless blue colourless B blue colourless green yellow C green yellow blue colourless D green yellow green yellow

1 marks

Answer: B

This question in 0654/11 May/June 2008

17 A chemical from a plant is tested. damp litmus paper chemical from a plant and lime (CaO) heat An alkaline gas, ammonia (NH3), is produced. What is the chemical from the plant? A cellulose B a protein C starch D a sugar

1 marks

Answer: B

This question in 0654/11 Oct/Nov 2008

24 Testing for which ion in solution involves reduction of the ion? A ammonium B chloride C nitrate D sulphate

1 marks

Answer: C

This question in 0654/11 Oct/Nov 2008

23 Which metal is used with aqueous sodium hydroxide to test for nitrate ions in solution? A aluminium B copper C magnesium D tin

1 marks

Answer: A

This question in 0654/11 May/June 2009

26 A liquid fuel is burned using the following apparatus. suction pump flame liquid fuel liquid limewater cooling mixture What is being tested for in the gases produced by the burning fuel? A carbon monoxide and carbon dioxide B carbon monoxide and water C carbon dioxide and water D carbon dioxide and sulfur dioxide

1 marks

Answer: C

This question in 0654/11 May/June 2009

20 Tests on some 10 cm3 samples of tap water give the following results. test result add 2 cm3 of soap solution and shake no lather boil the tap water, add 2 cm3 of soap solution and shake lather add acidified aqueous barium nitrate white precipitate What do the results show about the tap water? A It is hard and contains chloride ions. B It is hard and contains sulfate ions. C It is soft and contains chloride ions. D It is soft and contains sulfate ions.

1 marks

Answer: B

This question in 0654/11 Oct/Nov 2009

23 What is used to test for ammonia gas? A a lighted splint B aqueous sodium hydroxide C damp red litmus paper D limewater

1 marks

Answer: C

This question in 0654/11 Oct/Nov 2009

19 When concentrated salt solution is electrolysed, two gases X and Y are formed. X Y salt solution – + – + 6 V d.c. One of the gases explodes when tested with a burning splint and the other turns moist Universal Indicator paper red then white. What are X and Y? X Y A chlorine hydrogen B hydrogen chlorine C hydrogen oxygen D oxygen chlorine

1 marks

Answer: B

This question in 0654/11 May/June 2010

21 Ammonium sulfate is heated with solution X and ammonia gas is given off. A piece of moist red litmus paper and a piece of moist blue litmus paper are held in the gas. red litmus paper blue litmus paper ammonia gas ammonium sulfate and solution X heat What is solution X and what will be the colour change of the litmus paper? colour change of solution X litmus paper A hydrochloric acid blue to red B hydrochloric acid red to blue C sodium hydroxide blue to red D sodium hydroxide red to blue

1 marks

Answer: D

This question in 0654/11 May/June 2010

26 An aqueous solution of a compound of metal M is tested. • It does not give a characteristic flame colour. • It forms a precipitate with aqueous ammonia; the precipitate is soluble in excess ammonia. What is metal M? A copper B iron C potassium D zinc

1 marks

Answer: D

This question in 0654/11 May/June 2010

16 An aqueous solution of a compound of metal M is tested. • It does not give a characteristic flame colour. • It forms a precipitate with aqueous ammonia; the precipitate is soluble in excess ammonia. What is metal M? A copper B iron C potassium D zinc

1 marks

Answer: D

This question in 0654/12 May/June 2010

20 Ammonium sulfate is heated with solution X and ammonia gas is given off. A piece of moist red litmus paper and a piece of moist blue litmus paper are held in the gas. red litmus paper blue litmus paper ammonia gas ammonium sulfate and solution X heat What is solution X and what will be the colour change of the litmus paper? colour change of solution X litmus paper A hydrochloric acid blue to red B hydrochloric acid red to blue C sodium hydroxide blue to red D sodium hydroxide red to blue

1 marks

Answer: D

This question in 0654/12 May/June 2010

21 When concentrated salt solution is electrolysed, two gases X and Y are formed. X Y salt solution – + – + 6 V d.c. One of the gases explodes when tested with a burning splint and the other turns moist Universal Indicator paper red then white. What are X and Y? X Y A chlorine hydrogen B hydrogen chlorine C hydrogen oxygen D oxygen chlorine

1 marks

Answer: B

This question in 0654/12 May/June 2010

20 Sodium chloride solution is electrolysed and a gas is collected at each electrode. One gas decolourises moist litmus paper, the other gas burns with a pop. gas which decolourises gas which burns litmus paper with a pop platinum sodium chloride electrodes solution +ve –ve Which statement is correct? A Chlorine gas is collected at the anode. B Hydrogen gas is collected at the anode. C Oxygen gas is collected at the cathode. D The cathode is the positive electrode.

1 marks

Answer: A

This question in 0654/11 Oct/Nov 2010

22 Compound X is heated gently with aluminium powder and sodium hydroxide solution. damp red litmus paper X, aluminium and sodium hydroxide solution gentle heat The damp red litmus paper turns blue. What does X contain? A carbonate B chloride C nitrate D sulfate

1 marks

Answer: C

This question in 0654/11 Oct/Nov 2010

26 In separate experiments, an inert wire is dipped into two solutions, P and Q. The wire is then placed in the flame of a Bunsen burner. glass rod inert wire The table shows the results. solution P solution Q colour of Bunsen flame yellow green Which metal ions are present in the solutions? P Q A copper calcium B copper sodium C sodium calcium D sodium copper

1 marks

Answer: D

This question in 0654/11 Oct/Nov 2010

19 Sodium chloride solution is electrolysed and a gas is collected at each electrode. One gas decolourises moist litmus paper, the other gas burns with a pop. gas which decolourises gas which burns litmus paper with a pop platinum sodium chloride electrodes solution +ve –ve Which statement is correct? A Chlorine gas is collected at the anode. B Hydrogen gas is collected at the anode. C Oxygen gas is collected at the cathode. D The cathode is the positive electrode.

1 marks

Answer: A

This question in 0654/12 Oct/Nov 2010

20 Compound X is heated gently with aluminium powder and sodium hydroxide solution. damp red litmus paper X, aluminium and sodium hydroxide solution gentle heat The damp red litmus paper turns blue. What does X contain? A carbonate B chloride C nitrate D sulfate

1 marks

Answer: C

This question in 0654/12 Oct/Nov 2010

27 In separate experiments, an inert wire is dipped into two solutions, P and Q. The wire is then placed in the flame of a Bunsen burner. glass rod inert wire The table shows the results. solution P solution Q colour of Bunsen flame yellow green Which metal ions are present in the solutions? P Q A copper calcium B copper sodium C sodium calcium D sodium copper

1 marks

Answer: D

This question in 0654/12 Oct/Nov 2010

17 Sodium chloride solution is electrolysed and a gas is collected at each electrode. One gas decolourises moist litmus paper, the other gas burns with a pop. gas which decolourises gas which burns litmus paper with a pop platinum sodium chloride electrodes solution +ve –ve Which statement is correct? A Chlorine gas is collected at the anode. B Hydrogen gas is collected at the anode. C Oxygen gas is collected at the cathode. D The cathode is the positive electrode.

1 marks

Answer: A

This question in 0654/13 Oct/Nov 2010

18 Compound X is heated gently with aluminium powder and sodium hydroxide solution. damp red litmus paper X, aluminium and sodium hydroxide solution gentle heat The damp red litmus paper turns blue. What does X contain? A carbonate B chloride C nitrate D sulfate

1 marks

Answer: C

This question in 0654/13 Oct/Nov 2010

26 In separate experiments, an inert wire is dipped into two solutions, P and Q. The wire is then placed in the flame of a Bunsen burner. glass rod inert wire The table shows the results. solution P solution Q colour of Bunsen flame yellow green Which metal ions are present in the solutions? P Q A copper calcium B copper sodium C sodium calcium D sodium copper

1 marks

Answer: D

This question in 0654/13 Oct/Nov 2010

21 A solution is tested by adding acidified silver nitrate solution. Which ion causes the white precipitate to form? A chloride ions, Cl − B copper ions, Cu2+ C hydroxide ions, OH− D sodium ions, Na+

1 marks

Answer: A

This question in 0654/11 May/June 2011

23 Which statements about a positive test for a nitrate ion are correct? 1 Aluminium is used. 2 The nitrate ion is reduced to ammonia. 3 Ammonia turns damp litmus paper red. A 1, 2 and 3 B 1 and 2 only C 1 and 3 only D 2 and 3 only

1 marks

Answer: B

This question in 0654/11 May/June 2011

22 Which statements about a positive test for a nitrate ion are correct? 1 Aluminium is used. 2 The nitrate ion is reduced to ammonia. 3 Ammonia turns damp litmus paper red. A 1, 2 and 3 B 1 and 2 only C 1 and 3 only D 2 and 3 only

1 marks

Answer: B

This question in 0654/12 May/June 2011

23 A solution is tested by adding acidified silver nitrate solution. Which ion causes the white precipitate to form? A chloride ions, Cl − B copper ions, Cu2+ C hydroxide ions, OH− D sodium ions, Na+

1 marks

Answer: A

This question in 0654/12 May/June 2011

22 Which statements about a positive test for a nitrate ion are correct? 1 Aluminium is used. 2 The nitrate ion is reduced to ammonia. 3 Ammonia turns damp litmus paper red. A 1, 2 and 3 B 1 and 2 only C 1 and 3 only D 2 and 3 only

1 marks

Answer: B

This question in 0654/13 May/June 2011

23 A solution is tested by adding acidified silver nitrate solution. Which ion causes the white precipitate to form? A chloride ions, Cl − B copper ions, Cu2+ C hydroxide ions, OH− D sodium ions, Na+

1 marks

Answer: A

This question in 0654/13 May/June 2011

21 Using solution X, a student successfully tested for the presence of chloride ions. teat pipette solution X solution What is solution X and the result of the test? solution X result A dilute sulfuric acid yellow precipitate B dilute sulfuric acid white precipitate C silver nitrate solution yellow precipitate D silver nitrate solution white precipitate

1 marks

Answer: D

This question in 0654/11 Oct/Nov 2011

23 Which test and result show that a fertiliser contains nitrate ions? test result A warm with aqueous sodium hydroxide gas turns litmus blue B warm with aqueous sodium hydroxide gas turns litmus red C warm with aqueous sodium hydroxide, gas turns litmus blue then add aluminium metal D warm with aqueous sodium hydroxide, gas turns litmus red then add aluminium metal

1 marks

Answer: C

This question in 0654/11 Oct/Nov 2011

20 Using solution X, a student successfully tested for the presence of chloride ions. teat pipette solution X solution What is solution X and the result of the test? solution X result A dilute sulfuric acid yellow precipitate B dilute sulfuric acid white precipitate C silver nitrate solution yellow precipitate D silver nitrate solution white precipitate

1 marks

Answer: D

This question in 0654/12 Oct/Nov 2011

24 Which test and result show that a fertiliser contains nitrate ions? test result A warm with aqueous sodium hydroxide gas turns litmus blue B warm with aqueous sodium hydroxide gas turns litmus red C warm with aqueous sodium hydroxide, gas turns litmus blue then add aluminium metal D warm with aqueous sodium hydroxide, gas turns litmus red then add aluminium metal

1 marks

Answer: C

This question in 0654/12 Oct/Nov 2011

18 Using solution X, a student successfully tested for the presence of chloride ions. teat pipette solution X solution What is solution X and the result of the test? solution X result A dilute sulfuric acid yellow precipitate B dilute sulfuric acid white precipitate C silver nitrate solution yellow precipitate D silver nitrate solution white precipitate

1 marks

Answer: D

This question in 0654/13 Oct/Nov 2011

22 Which test and result show that a fertiliser contains nitrate ions? test result A warm with aqueous sodium hydroxide gas turns litmus blue B warm with aqueous sodium hydroxide gas turns litmus red C warm with aqueous sodium hydroxide, gas turns litmus blue then add aluminium metal D warm with aqueous sodium hydroxide, gas turns litmus red then add aluminium metal

1 marks

Answer: C

This question in 0654/13 Oct/Nov 2011

19 The diagram shows litmus paper testing the gas that is given off from the contents of the test tube. piece of damp litmus paper sodium nitrate, aluminium and aqueous sodium hydroxide heat The damp litmus paper A turns blue. B turns colourless. C turns red. D turns red then colourless.

1 marks

Answer: B

This question in 0654/11 May/June 2012

19 A coloured solution of compound X gives a white precipitate with acidified silver nitrate. What is X? A calcium chloride B calcium sulfate C copper(II) chloride D copper(II) sulfate

1 marks

Answer: C

This question in 0654/12 May/June 2012

19 A coloured solution of compound X gives a white precipitate with acidified silver nitrate. What is X? A calcium chloride B calcium sulfate C copper(II) chloride D copper(II) sulfate

1 marks

Answer: C

This question in 0654/13 May/June 2012

18 When ammonium sulfate is heated with solution X, ammonia gas is given off. A piece of moist red litmus paper and a piece of moist blue litmus paper are held in the gas. red litmus paper blue litmus paper ammonia gas ammonium sulfate and solution X heat What is solution X and how does the colour of the litmus paper change? colour change of solution X litmus paper A hydrochloric acid blue to red B hydrochloric acid red to blue C sodium hydroxide blue to red D sodium hydroxide red to blue

1 marks

Answer: D

This question in 0654/11 May/June 2013

18 When ammonium sulfate is heated with solution X, ammonia gas is given off. A piece of moist red litmus paper and a piece of moist blue litmus paper are held in the gas. red litmus paper blue litmus paper ammonia gas ammonium sulfate and solution X heat What is solution X and how does the colour of the litmus paper change? colour change of solution X litmus paper A hydrochloric acid blue to red B hydrochloric acid red to blue C sodium hydroxide blue to red D sodium hydroxide red to blue

1 marks

Answer: D

This question in 0654/12 May/June 2013

21 The diagram shows the electrolysis of a compound. d.c. power source switch +ve –ve P Q concentrated potassium halide solution When the switch is closed, the solution near electrode P turns brown because a halogen is formed. The positive electrode P is called the ……1……, and the halogen is ……2…… . 1 2 A anode bromine B anode chlorine C cathode bromine D cathode chlorine

1 marks

Answer: A

This question in 0654/12 May/June 2013

22 Sodium chloride solution is electrolysed and a gas is collected at each electrode. One gas decolourises moist litmus paper, the other gas burns with a pop. gas which decolourises gas which burns litmus paper with a pop platinum sodium chloride electrodes solution +ve –ve Which statement is correct? A Chlorine gas is collected at the anode. B Hydrogen gas is collected at the anode. C Oxygen gas is collected at the cathode. D Sodium is formed at the cathode.

1 marks

Answer: A

This question in 0654/12 May/June 2013

19 When ammonium sulfate is heated with solution X, ammonia gas is given off. A piece of moist red litmus paper and a piece of moist blue litmus paper are held in the gas. red litmus paper blue litmus paper ammonia gas ammonium sulfate and solution X heat What is solution X and how does the colour of the litmus paper change? colour change of solution X litmus paper A hydrochloric acid blue to red B hydrochloric acid red to blue C sodium hydroxide blue to red D sodium hydroxide red to blue

1 marks

Answer: D

This question in 0654/13 May/June 2013

21 Sodium chloride solution is electrolysed and a gas is collected at each electrode. One gas decolourises moist litmus paper, the other gas burns with a pop. gas which decolourises gas which burns litmus paper with a pop platinum sodium chloride electrodes solution +ve –ve Which statement is correct? A Chlorine gas is collected at the anode. B Hydrogen gas is collected at the anode. C Oxygen gas is collected at the cathode. D Sodium is formed at the cathode.

1 marks

Answer: A

This question in 0654/13 May/June 2013

23 An iron nail dissolves in an acid to form a salt solution. acid iron nail The salt solution forms a green precipitate with sodium hydroxide solution. The salt solution also forms a white precipitate with barium chloride solution. What is the salt solution? A iron(II) chloride B iron(III) chloride C iron(II) sulfate D iron(III) sulfate

1 marks

Answer: C

This question in 0654/13 Oct/Nov 2013

26 In which experiment does limewater become milky? A B oxygen hydrochloric limewater acid heat limewater C D limestone limewater heat limestone limewater

1 marks

Answer: D

This question in 0654/13 Oct/Nov 2013

17 When dilute sulfuric acid is electrolysed each electrode gives off a different gas. + _ positive negative electrode electrode dilute sulfuric acid Which test identifies the gas given off at the positive electrode? A Damp red litmus is bleached. B Damp red litmus turns blue. C A glowing splint relights. D A lighted splint burns with a squeaky pop.

1 marks

Answer: C

This question in 0654/11 May/June 2014

22 Hydrochloric acid is added to calcium carbonate. Gas X, which turns limewater milky, is given off. What is X? A carbon dioxide B chlorine C hydrogen D oxygen

1 marks

Answer: A

This question in 0654/11 May/June 2014

22 A student tests an aqueous solution for the presence of sulfate ions. What is the correct test and observation for sulfate ions? A Acidify the solution and add silver ions to produce a cream precipitate. B Acidify the solution and add aqueous barium ions to produce a white precipitate. C Add aqueous iron(III) ions to produce a brown precipitate. D Add copper(II) ions to produce a pale blue precipitate.

1 marks

Answer: B

This question in 0654/12 May/June 2014

16 When dilute sulfuric acid is electrolysed each electrode gives off a different gas. + _ positive negative electrode electrode dilute sulfuric acid Which test identifies the gas given off at the positive electrode? A Damp red litmus is bleached. B Damp red litmus turns blue. C A glowing splint relights. D A lighted splint burns with a squeaky pop.

1 marks

Answer: C

This question in 0654/13 May/June 2014

21 Hydrochloric acid is added to calcium carbonate. Gas X, which turns limewater milky, is given off. What is X? A carbon dioxide B chlorine C hydrogen D oxygen

1 marks

Answer: A

This question in 0654/13 May/June 2014

21 The diagram shows a chemical reaction that produces a gas. damp litmus paper reaction mixture heat The gas bleaches damp litmus paper. What is the gas? A ammonia B chlorine C hydrogen D oxygen

1 marks

Answer: B

This question in 0654/11 May/June 2015

21 What is observed when aqueous barium ions are added to sulfuric acid? A blue precipitate B brown gas C colourless gas D white precipitate

1 marks

Answer: D

This question in 0654/12 May/June 2015

21 Sodium hydroxide solution and aluminium powder are added to a salt solution and warmed. A gas is produced that turns moist red litmus paper blue. Which anion is present in the salt? A carbonate B chloride C nitrate D sulfate

1 marks

Answer: C

This question in 0654/13 May/June 2015

23 The table shows the results of some tests on a compound. test result adding dilute sodium hydroxide green precipitate adding acidified barium nitrate white precipitate What is the compound? A iron(II) chloride B iron(II) sulfate C iron(III) chloride D iron(III) sulfate

1 marks

Answer: B

This question in 0654/11 Oct/Nov 2015

22 Sulfuric acid and sodium carbonate react and release a colourless gas. sulfuric acid colourless gas gas jar sodium carbonate trough of water What is the gas? A carbon dioxide B hydrogen C hydrogen sulfide D sulfur dioxide

1 marks

Answer: A

This question in 0654/12 Oct/Nov 2015

23 Which test and result identify aqueous ammonium ions? test result A add aqueous blue precipitate sodium hydroxide B add aqueous white precipitate sodium hydroxide C heat with aqueous gas evolved turns damp sodium hydroxide red litmus paper blue D heat with aqueous gas evolved turns damp sodium hydroxide and blue litmus paper red aluminium powder

1 marks

Answer: C

This question in 0654/12 Oct/Nov 2015

22 An unknown aqueous solution is mixed with nitric acid and silver nitrate solution. A white precipitate is formed. Which ion is present in the unknown aqueous solution? A carbonate B chloride C nitrate D sulfate

1 marks

Answer: B

This question in 0654/13 Oct/Nov 2015

20 Which test and result show that a fertiliser contains nitrate ions? test result A warm with aqueous sodium hydroxide gas turns litmus blue B warm with aqueous sodium hydroxide gas turns litmus red C warm with aqueous sodium hydroxide, gas turns litmus blue then add aluminium metal D warm with aqueous sodium hydroxide, gas turns litmus red then add aluminium metal

1 marks

Answer: C

This question in 0654/11 May/June 2016

19 Dilute hydrochloric acid is added to each of the test-tubes shown. magnesium limestone (calcium carbonate) test-tube 1 test-tube 2 Which gases are produced? test-tube 1 test-tube 2 A chlorine carbon dioxide B chlorine oxygen C hydrogen carbon dioxide D hydrogen oxygen

1 marks

Answer: C

This question in 0654/12 May/June 2016

20 Which test and result show that a fertiliser contains nitrate ions? test result A warm with aqueous sodium hydroxide gas turns litmus blue B warm with aqueous sodium hydroxide gas turns litmus red C warm with aqueous sodium hydroxide, gas turns litmus blue then add aluminium metal D warm with aqueous sodium hydroxide, gas turns litmus red then add aluminium metal

1 marks

Answer: C

This question in 0654/12 May/June 2016

20 Which test and result show that a fertiliser contains nitrate ions? test result A warm with aqueous sodium hydroxide gas turns litmus blue B warm with aqueous sodium hydroxide gas turns litmus red C warm with aqueous sodium hydroxide, gas turns litmus blue then add aluminium metal D warm with aqueous sodium hydroxide, gas turns litmus red then add aluminium metal

1 marks

Answer: C

This question in 0654/13 May/June 2016

17 Apparatus used to electrolyse aqueous copper chloride is shown. positive electrode negative electrode gas X aqueous copper chloride The negative electrode is called the … 1 … . Gas X turns damp red litmus paper ««2«« . Which words complete gaps 1 and 2? 1 2 A anode blue B anode white C cathode blue D cathode white

1 marks

Answer: D

This question in 0654/11 Oct/Nov 2016

21 In which experiment does limewater become milky? A B oxygen hydrochloric limewater acid heat limewater C D limestone limewater heat limestone limewater

1 marks

Answer: D

This question in 0654/11 Oct/Nov 2016

21 In which experiment does limewater become milky? A B oxygen hydrochloric limewater acid heat limewater C D limestone limewater heat limestone limewater

1 marks

Answer: D

This question in 0654/12 Oct/Nov 2016

21 In which experiment does limewater become milky? A B oxygen hydrochloric limewater acid heat limewater C D limestone limewater heat limestone limewater

1 marks

Answer: D

This question in 0654/13 Oct/Nov 2016

25 Four solutions are tested with Universal Indicator paper and with anhydrous copper(II) sulfate. Which row shows the observations for pure water? Universal Indicator paper anhydrous copper(II) sulfate A turns blue turns blue B turns blue turns white C turns green turns blue D turns green turns white

1 marks

Answer: C

This question in 0654/11 May/June 2017

21 Two aqueous salt solutions X and Y are tested in three separate tests. The results are shown. result test X Y add aqueous light blue precipitate green precipitate sodium hydroxide add dilute nitric acid and white precipitate no change aqueous silver nitrate add dilute nitric acid and no change white precipitate aqueous barium nitrate What are X and Y? X Y A copper chloride iron(II) sulfate B copper chloride iron(III) sulfate C copper sulfate iron(II) chloride D copper sulfate iron(III) chloride

1 marks

Answer: A

This question in 0654/12 May/June 2017

27 Substance X is burned in oxygen. The combustion products pass through the apparatus as shown. combustion products suction pump ice limewater turns milky water collects What is X? A C B CO C CH4 D H2

1 marks

Answer: C

This question in 0654/12 May/June 2017

21 Aqueous iron(II) chloride is added to aqueous sodium hydroxide and to aqueous silver nitrate in separate tests. Which row describes the observations? aqueous aqueous sodium hydroxide silver nitrate A green precipitate white precipitate B green precipitate yellow precipitate C red-brown precipitate white precipitate D red-brown precipitate yellow precipitate

1 marks

Answer: A

This question in 0654/13 May/June 2017

23 Compound X is heated with a mixture of aqueous sodium hydroxide and aluminium powder. A gas is made which turns damp red litmus blue. Which compound cannot be X? A ammonium hydroxide B ammonium nitrate C potassium hydroxide D potassium nitrate

1 marks

Answer: C

This question in 0654/11 Oct/Nov 2017

23 Substance X is tested using aqueous barium ions under acidic conditions. A white precipitate forms. Which anion is present in X? A ammonium B carbonate C nitrate D sulfate

1 marks

Answer: D

This question in 0654/12 Oct/Nov 2017

25 Which gas is formed when ammonium nitrate is warmed with aqueous sodium hydroxide? A ammonia B ammonium C nitrogen D nitrogen dioxide

1 marks

Answer: A

This question in 0654/12 Oct/Nov 2017

7 The diagram shows apparatus that could be used to show the presence of carbon dioxide in exhaled air. Which liquid would be used in the test-tube? A amylase solution B limewater C sugar solution D water

1 marks

Answer: B

This question in 0654/13 Oct/Nov 2017

25 What is warmed with a salt to test for ammonium ions? A aqueous barium chloride B aqueous litmus C aqueous silver nitrate D aqueous sodium hydroxide

1 marks

Answer: D

This question in 0654/13 Oct/Nov 2017

21 A mixture of two gases is shaken with limewater. mixture of two gases gas jar limewater The limewater turns milky. The remaining gas relights a glowing splint. What are the gases? A carbon dioxide and hydrogen B carbon dioxide and oxygen C carbon monoxide and hydrogen D hydrogen and oxygen

1 marks

Answer: B

This question in 0654/11 Oct/Nov 2018

23 Which row describes the colour changes when water is added to anhydrous copper(II) sulfate and to cobalt(II) chloride? copper(II) sulfate cobalt(II) chloride A blue → white blue → pink B blue → white pink → blue C white → blue blue → pink D white → blue pink → blue

1 marks

Answer: C

This question in 0654/11 May/June 2019

8 Limewater can be used to test for differences in composition between inspired and expired air. Which row is correct? appearance type of air conclusion of limewater A expired clear to milky more carbon dioxide present B expired milky to clear more carbon dioxide present C inspired clear to milky more oxygen present D inspired milky to clear more oxygen present

1 marks

Answer: A

This question in 0654/12 May/June 2019

8 Limewater can be used to test for differences in composition between inspired and expired air. Which row is correct? appearance type of air conclusion of limewater A expired clear to milky more carbon dioxide present B expired milky to clear more carbon dioxide present C inspired clear to milky more oxygen present D inspired milky to clear more oxygen present

1 marks

Answer: A

This question in 0654/13 May/June 2019

23 When substance X is added to blue cobalt(II) chloride paper, the paper turns pink. What is X? A ammonia B an acid C chlorine gas D water

1 marks

Answer: D

This question in 0654/13 Oct/Nov 2019

21 Which gas turns damp red litmus paper blue? A ammonia B carbon dioxide C chlorine D hydrogen

1 marks

Answer: A

This question in 0654/11 May/June 2020

21 Which test is used to identify sulfate ions? A aqueous barium ions under acidic conditions B aqueous silver nitrate under acidic conditions C dilute acid and then limewater D reduction with aluminium

1 marks

Answer: A

This question in 0654/12 May/June 2020

19 What test is used to test for chlorine? A damp litmus paper B glowing splint C lighted splint D limewater

1 marks

Answer: A

This question in 0654/13 May/June 2020

22 A colourless liquid is added to blue cobalt chloride paper. The paper turns pink. What does this show about the liquid? A It contains water. B It is acidic. C It is neutral. D It is pure water.

1 marks

Answer: A

This question in 0654/13 May/June 2020

20 Which chemical test does not produce a precipitate? A carbon dioxide and limewater B carbonate ions and dilute hydrochloric acid C chloride ions and aqueous silver nitrate D copper(II) ions and aqueous sodium hydroxide

1 marks

Answer: B

This question in 0654/11 Oct/Nov 2020

23 Blue cobalt(II) chloride paper is added to a liquid. It changes from blue to pink. What is the liquid? A bromine B ethanol C petrol D water

1 marks

Answer: D

This question in 0654/12 Oct/Nov 2020

21 Substance X is insoluble in water. It reacts with dilute nitric acid to produce solution Y and a gas which turns limewater milky. A white precipitate is formed when aqueous sodium hydroxide is added to solution Y. This precipitate remains when excess sodium hydroxide is added. What is substance X? A calcium carbonate B calcium chloride C zinc carbonate D zinc chloride

1 marks

Answer: A

This question in 0654/12 Feb/March 2021

24 Both anhydrous cobalt(II) chloride and anhydrous copper(II) sulfate are used as chemical tests for water. Which row describes the effect of water on the colour of anhydrous cobalt(II) chloride and anhydrous copper(II) sulfate? anhydrous anhydrous cobalt(II) chloride copper(II) sulfate A blue to pink blue to white B blue to pink white to blue C pink to blue blue to white D pink to blue white to blue

1 marks

Answer: B

This question in 0654/12 Feb/March 2021

19 Three different tests are carried out on an aqueous solution of substance X. The results are shown. test result add a few drops of aqueous sodium hydroxide blue precipitate add acidified aqueous silver nitrate no precipitate add acidified aqueous barium nitrate white precipitate What is X? A copper(II) chloride B copper(II) sulfate C iron(II) chloride D iron(II) sulfate

1 marks

Answer: B

This question in 0654/11 May/June 2021

23 The apparatus used to investigate the combustion of ethanol is shown. The products of combustion are passed over anhydrous cobalt(II) chloride. to suction pump anhydrous cobalt(II) chloride spirit burner ethanol How does the colour of the cobalt(II) chloride change during the investigation? A blue to pink B blue to white C pink to blue D white to blue

1 marks

Answer: A

This question in 0654/11 May/June 2021

19 The results of two tests on substance X are listed. 1 A lilac flame is produced in a flame test. 2 A gas which turns damp red litmus blue is produced when X is heated with aluminium powder and aqueous sodium hydroxide. What is X? A potassium nitrate B potassium sulfate C sodium nitrate D sodium sulfate

1 marks

Answer: A

This question in 0654/12 May/June 2021

19 The results of two tests on substance X are listed. 1 A lilac flame is produced in a flame test. 2 A gas which turns damp red litmus blue is produced when X is heated with aluminium powder and aqueous sodium hydroxide. What is X? A potassium nitrate B potassium sulfate C sodium nitrate D sodium sulfate

1 marks

Answer: A

This question in 0654/13 May/June 2021

17 The diagram shows the electrolysis of a compound. switch + – P Q electrolyte When the switch is closed, the solution around electrode P turns orange because a halogen is formed. The positive electrode P is called the ……1……, and the halogen is ……2…… . Which words complete gaps 1 and 2? 1 2 A anode bromine B anode chlorine C cathode bromine D cathode chlorine

1 marks

Answer: A

This question in 0654/12 Oct/Nov 2021

20 A white solid X dissolves in dilute hydrochloric acid. A gas is produced which turns limewater milky. A flame test is carried out on solid X and produces a red coloured flame. What is X? A lithium carbonate B lithium chloride C potassium carbonate D potassium chloride

1 marks

Answer: A

This question in 0654/12 Oct/Nov 2021

20 A gas turns damp litmus paper white. What is the gas? A carbon dioxide B chlorine C hydrogen chloride D sulfur dioxide

1 marks

Answer: B

This question in 0654/13 Oct/Nov 2021

19 Which test and its result identifies aqueous bromide ions? A adding acidified aqueous silver nitrate forming a cream precipitate B adding acidified aqueous silver nitrate forming a white precipitate C adding aluminium foil and heating with sodium hydroxide forming a gas that turns red litmus paper blue D adding dilute acid forming a gas that produces a white precipitate when bubbled through limewater

1 marks

Answer: A

This question in 0654/12 Feb/March 2022

20 Which row shows the flame test colours for lithium and sodium? lithium sodium A lilac blue-green B lilac yellow C red blue-green D red yellow

1 marks

Answer: D

This question in 0654/11 May/June 2022

20 When aqueous potassium hydroxide is warmed with ammonium chloride, a gas is given off. Which test result identifies the gas? A It bleaches pH paper. B It turns anhydrous cobalt(II) chloride blue. C It turns universal indicator red. D It turns red litmus blue.

1 marks

Answer: D

This question in 0654/12 May/June 2022

20 When aqueous potassium hydroxide is warmed with ammonium chloride, a gas is given off. Which test result identifies the gas? A It bleaches pH paper. B It turns anhydrous cobalt(II) chloride blue. C It turns universal indicator red. D It turns red litmus blue.

1 marks

Answer: D

This question in 0654/13 May/June 2022

25 Which colour change is observed when water is tested using copper(II) sulfate? A blue  pink B blue  white C white  blue D white  pink

1 marks

Answer: C

This question in 0654/13 May/June 2022

20 Copper carbonate is reacted with dilute hydrochloric acid. Which gas is given off? A carbon dioxide B hydrogen C nitrogen D sulfur dioxide

1 marks

Answer: A

This question in 0654/11 Oct/Nov 2022

25 Water is tested with white copper(II) sulfate powder and with blue cobalt(II) chloride paper. Which row shows the results of the tests? copper(II) sulfate cobalt(II) chloride A turns blue stays blue B turns blue turns pink C stays white turns pink D stays white stays blue

1 marks

Answer: B

This question in 0654/11 Oct/Nov 2022

25 Which substance turns blue when it is added to pure water? A anhydrous copper(II) sulfate B anhydrous cobalt(II) chloride C red litmus D universal indicator

1 marks

Answer: A

This question in 0654/13 Oct/Nov 2022

21 Substance X is mixed with aqueous sodium hydroxide. A green precipitate is produced. Which metal ion is present in X? A Cu2+ B Fe2+ C Fe3+ D Zn2+

1 marks

Answer: B

This question in 0654/11 Oct/Nov 2023

3 A colourless liquid gives the test results shown. test colour obtained Benedict’s blue biuret purple iodine blue / black Which nutrients are in the colourless liquid? A protein, reducing sugar and starch B protein and reducing sugar only C protein and starch only D protein only

1 marks

Answer: C

This question in 0654/12 Oct/Nov 2023

20 A piece of damp blue litmus paper is put in a test-tube of a gas. The litmus paper turns red and then changes to white. What is the gas? A ammonia B carbon dioxide C chlorine D oxygen

1 marks

Answer: C

This question in 0654/13 Oct/Nov 2023

8 What is used to test for the presence of carbon dioxide? A Benedict’s solution B ethanol C iodine solution D limewater

1 marks

Answer: D

This question in 0654/12 Feb/March 2024

18 Concentrated aqueous sodium chloride is electrolysed using inert electrodes. Which row describes observations of the tests on the gases collected at the electrodes? anode gas cathode gas A turns damp red litmus paper blue ‘pops’ with a lighted splint B turns damp red litmus paper blue relights a glowing splint C turns damp red litmus paper white ‘pops’ with a lighted splint D turns damp red litmus paper white relights a glowing splint

1 marks

Answer: C

This question in 0654/12 Feb/March 2024

21 White solid X reacts with dilute hydrochloric acid. A gas is produced which turns limewater milky. A flame test is done on solid X and produces a red coloured flame. What is X? A lithium carbonate B lithium chloride C potassium carbonate D potassium chloride

1 marks

Answer: A

This question in 0654/12 May/June 2024

21 White solid X reacts with dilute hydrochloric acid. A gas is produced which turns limewater milky. A flame test is done on solid X and produces a red coloured flame. What is X? A lithium carbonate B lithium chloride C potassium carbonate D potassium chloride

1 marks

Answer: A

This question in 0654/13 May/June 2024

23 The results of two tests on compound P are shown. test observation flame test red flame addition of acidified silver nitrate white precipitate What is P? A lithium bromide B lithium chloride C sodium bromide D sodium chloride

1 marks

Answer: B

This question in 0654/11 Oct/Nov 2024

21 Which chemical test does not produce a precipitate? A carbon dioxide and limewater B carbonate ions and dilute hydrochloric acid C chloride ions and aqueous silver nitrate D copper(II) ions and aqueous sodium hydroxide

1 marks

Answer: B

This question in 0654/12 Oct/Nov 2024

21 Which chemical test does not produce a precipitate? A carbon dioxide and limewater B carbonate ions and dilute hydrochloric acid C chloride ions and aqueous silver nitrate D copper(II) ions and aqueous sodium hydroxide

1 marks

Answer: B

This question in 0654/13 Oct/Nov 2024

27 Which gas turns damp red litmus paper blue? A ammonia B carbon dioxide C chlorine D hydrogen

1 marks

Answer: A

This question in 0654/12 Feb/March 2025

23 Four liquids are tested with universal indicator and with anhydrous copper(II) sulfate. Which row shows the observations for pure water? anhydrous universal indicator copper(II) sulfate A turns blue turns blue B turns blue turns white C turns green turns blue D turns green turns white

1 marks

Answer: C

This question in 0654/11 May/June 2025

27 Aqueous ammonia is separately added dropwise and then in excess to four different aqueous cations. Which cations give a precipitate that then dissolves? 1 Ca2+ 2 Cu2+ 3 Fe2+ 4 Zn2+ A 1 and 3 B 1 and 4 C 2 and 3 D 2 and 4

1 marks

Answer: D

This question in 0654/11 May/June 2025

22 Which row shows the colour of copper(II) sulfate and of cobalt(II) chloride when they are added to water? copper(II) sulfate cobalt(II) chloride A blue blue B blue pink C white blue D white pink

1 marks

Answer: B

This question in 0654/12 May/June 2025

22 Which row shows the colour of copper(II) sulfate and of cobalt(II) chloride when they are added to water? copper(II) sulfate cobalt(II) chloride A blue blue B blue pink C white blue D white pink

1 marks

Answer: B

This question in 0654/13 May/June 2025

27 What is the colour of the flame produced by sodium in the flame test? A blue-green B red C lilac D yellow

1 marks

Answer: D

This question in 0654/11 Oct/Nov 2025

27 Acidified aqueous silver nitrate is added to a solution. Which ion causes a white precipitate to form? A chloride ions, Cl  B copper ions, Cu2+ C hydroxide ions, OH D sodium ions, Na+

1 marks

Answer: A

This question in 0654/12 Oct/Nov 2025

27 Acidified aqueous silver nitrate is added to a solution. Which ion causes a white precipitate to form? A chloride ions, Cl  B copper ions, Cu2+ C hydroxide ions, OH D sodium ions, Na+

1 marks

Answer: A

This question in 0654/13 Oct/Nov 2025