Identification of ions and gases — Paper 1 · IGCSE Science - Combined 0653

19 Two properties of a white solid are shown. • The solid dissolves in water forming an alkaline solution. • The solid gives a yellow flame test. Which solid has both of these properties? A calcium chloride B calcium hydroxide C sodium chloride D sodium hydroxide

1 marks

Answer: D

This question in 0653/11 May/June 2006

24 A substance, X, is dissolved in water and electrolysed as shown. 6 V d.c. + – carbon carbon anode cathode solution of X in water A yellow-green gas is given off at the anode and the cathode becomes brown. What is X? A copper(II) chloride B lead(II) bromide C sodium bromide D sodium chloride

1 marks

Answer: A

This question in 0653/11 Oct/Nov 2006

24 The diagrams show the results of adding an excess of NaOH(aq), NH3(aq), to a solution of salt S. NaOH(aq) NH3(aq) added added pale blue deep blue precipitate solution Which metal ion is present in salt S? A Cu2+ B Fe2+ C Fe3+ D Zn2+

1 marks

Answer: A

This question in 0653/11 May/June 2007

22 Which aqueous reagents give a white precipitate when added to aqueous zinc chloride? sodium barium silver hydroxide nitrate nitrate v v v 0 0O WwW > v v x v x v x v v

1 marks

Answer: C

This question in 0653/11 May/June 2008

20 A firework gives a bright flame in which yellow and red colours are seen. Which two metals are present in the firework? A calcium and copper B copper and potassium C potassium and sodium D sodium and calcium

1 marks

Answer: D

This question in 0653/11 May/June 2009

24 Testing for the gases chlorine, hydrogen and oxygen requires different methods. For which gases is a splint used? Cl, H2 Oz A v v x B v x x Cc x v v D x x v

1 marks

Answer: C

This question in 0653/11 May/June 2009

26 A hydrocarbon is burned in excess oxygen. The combustion products are passed through the apparatus shown. combustion suction products ice limewater X What collects at X and what happens to the limewater? collects at X limewater turns A soot cloudy B soot red C water cloudy D water red

1 marks

Answer: C

This question in 0653/11 May/June 2010

24 A hydrocarbon is burned in excess oxygen. The combustion products are passed through the apparatus shown. combustion suction products ice limewater X What collects at X and what happens to the limewater? collects at X limewater turns A soot cloudy B soot red C water cloudy D water red

1 marks

Answer: C

This question in 0653/12 May/June 2010

24 A hydrocarbon is burned in excess oxygen. The combustion products are passed through the apparatus shown. combustion suction products ice limewater X What collects at X and what happens to the limewater? collects at X limewater turns A soot cloudy B soot red C water cloudy D water red

1 marks

Answer: C

This question in 0653/13 May/June 2010

21 Metal X reacts vigorously with dilute hydrochloric acid. Salts of metal X give a red colour in a flame test. What is X? A calcium B copper C potassium D sodium

1 marks

Answer: A

This question in 0653/11 May/June 2011

20 Metal X reacts vigorously with dilute hydrochloric acid. Salts of metal X give a red colour in a flame test. What is X? A calcium B copper C potassium D sodium

1 marks

Answer: A

This question in 0653/12 May/June 2011

21 In an experiment the elements calcium, copper, potassium and sodium were separately reacted with water. In a second experiment a flame test was carried out on compounds of each of the elements. compound of element element water Bunsen burner Which row correctly shows the reaction of the elements with water and the colour of the flame? reaction with colour of the element water flame A calcium vigorous green B copper no reaction red C potassium vigorous lilac D sodium no reaction yellow

1 marks

Answer: C

This question in 0653/11 Oct/Nov 2011

21 In an experiment the elements calcium, copper, potassium and sodium were separately reacted with water. In a second experiment a flame test was carried out on compounds of each of the elements. compound of element element water Bunsen burner Which row correctly shows the reaction of the elements with water and the colour of the flame? reaction with colour of the element water flame A calcium vigorous green B copper no reaction red C potassium vigorous lilac D sodium no reaction yellow

1 marks

Answer: C

This question in 0653/12 Oct/Nov 2011

16 In an experiment the elements calcium, copper, potassium and sodium were separately reacted with water. In a second experiment a flame test was carried out on compounds of each of the elements. compound of element element water Bunsen burner Which row correctly shows the reaction of the elements with water and the colour of the flame? reaction with colour of the element water flame A calcium vigorous green B copper no reaction red C potassium vigorous lilac D sodium no reaction yellow

1 marks

Answer: C

This question in 0653/13 Oct/Nov 2011

20 Aqueous sodium hydroxide and aqueous ammonia are added separately to aqueous solutions X and Y. The results are shown below. aqueous sodium aqueous ammonia added hydroxide added light blue precipitate, light blue precipitate, solution X soluble in excess to form insoluble in excess a dark blue solution green precipitate, green precipitate, solution Y insoluble in excess insoluble in excess Which metals ions are present in solution X and solution Y? solution X solution Y A Cu(II) Fe(III) B Cu(II) Fe(II) C Fe(II) Cu(II) D Fe(III) Cu(II)

1 marks

This question in 0653/11 May/June 2012

24 Copper(II) oxide is mixed with a solid Q. On heating the mixture, a reaction occurs and the limewater turns milky. copper(II) oxide and solid Q heat limewater What is solid Q? A carbon B iron C sulfur D zinc

1 marks

This question in 0653/11 May/June 2012

20 Acid X reacts with metal Y. A colourless gas is given off and a pale green solution is produced. Two tests are carried out on the solution. test reagent(s) added result 1 aqueous silver nitrate and nitric acid white precipitate 2 aqueous sodium hydroxide green precipitate What are acid X and metal Y? acid metal A hydrochloric iron B hydrochloric zinc C sulfuric iron D sulfuric zinc

1 marks

Answer: A

This question in 0653/12 May/June 2012

20 Acid X reacts with metal Y. A colourless gas is given off and a pale green solution is produced. Two tests are carried out on the solution. test reagent(s) added result 1 aqueous silver nitrate and nitric acid white precipitate 2 aqueous sodium hydroxide green precipitate What are acid X and metal Y? acid metal A hydrochloric iron B hydrochloric zinc C sulfuric iron D sulfuric zinc

1 marks

Answer: A

This question in 0653/13 May/June 2012

24 Copper(II) oxide is mixed with a solid Q. On heating the mixture, a reaction occurs and the limewater turns milky. copper(II) oxide and solid Q heat limewater What is solid Q? A carbon B iron C sulfur D zinc

1 marks

Answer: A

This question in 0653/13 May/June 2012

25 Which chemical test shows the presence of water? A Water has a boiling point of 100 °C. B Water has a freezing point of 0 °C. C Water turns anhydrous cobalt chloride from blue to pink. D Water turns anhydrous copper sulfate from blue to white.

1 marks

Answer: C

This question in 0653/12 May/June 2013

25 Which pair of gases can be identified using limewater and damp litmus paper? A carbon dioxide and chlorine B carbon dioxide and hydrogen C chlorine and oxygen D hydrogen and chlorine

1 marks

Answer: A

This question in 0653/13 May/June 2013

23 Steam is passed over a heated metal. metal gas produced steam heat water The metal reacts and a gas is produced. The gas ignites with a pop when tested with a lighted splint. What are the metal and the gas? metal gas A copper hydrogen B copper oxygen C magnesium oxygen D zinc hydrogen

1 marks

Answer: D

This question in 0653/13 Oct/Nov 2013

23 Which two reagents form a white precipitate when they are mixed? A barium chloride and hydrochloric acid B barium chloride and nitric acid C silver nitrate and hydrochloric acid D silver nitrate and nitric acid

1 marks

Answer: C

This question in 0653/12 May/June 2014

21 The table shows the results of tests on an aqueous solution of X. test result blue litmus paper turns red aqueous silver nitrate white precipitate formed What is X? A HCl B HNO3 C NaCl D NaOH

1 marks

Answer: A

This question in 0653/11 May/June 2015

22 The table shows the results of tests on an aqueous solution of X. test result blue litmus paper turns red aqueous silver nitrate white precipitate formed What is X? A HCl B HNO3 C NaCl D NaOH

1 marks

Answer: A

This question in 0653/12 May/June 2015

22 The table shows the results of tests on an aqueous solution of X. test result blue litmus paper turns red aqueous silver nitrate white precipitate formed What is X? A HCl B HNO3 C NaCl D NaOH

1 marks

Answer: A

This question in 0653/13 May/June 2015

21 Compound X reacts with dilute nitric acid to give a colourless gas which turns limewater milky. A solution of compound X reacts with sodium hydroxide solution to form a pale blue precipitate. What is X? A copper(II) carbonate B copper(II) chloride C iron(II) carbonate D iron(II) chloride

1 marks

Answer: A

This question in 0653/11 Oct/Nov 2015

22 A substance reacts with dilute acid, producing a gas. The gas ignites with a pop when tested with a lighted splint. What is the substance? A copper B copper(II) oxide C magnesium D magnesium carbonate

1 marks

Answer: C

This question in 0653/11 Oct/Nov 2015

22 A substance reacts with dilute acid, producing a gas. The gas ignites with a pop when tested with a lighted splint. What is the substance? A copper B copper(II) oxide C magnesium D magnesium carbonate

1 marks

Answer: C

This question in 0653/12 Oct/Nov 2015

8 Carbon dioxide turns limewater milky (cloudy). Which diagram shows apparatus being used to demonstrate that expired air contains more carbon dioxide than inspired air? A B breathe in and out breathe in and out slowly through slowly through air this tube air air this tube air limewater limewater milky clear milky clear C D breathe in and out breathe in and out slowly through slowly through air this tube air air this tube air limewater limewater clear milky clear milky

1 marks

Answer: D

This question in 0653/13 Oct/Nov 2015

22 A substance reacts with dilute acid, producing a gas. The gas ignites with a pop when tested with a lighted splint. What is the substance? A copper B copper(II) oxide C magnesium D magnesium carbonate

1 marks

Answer: C

This question in 0653/13 Oct/Nov 2015

26 What is a chemical test for water? A Blue cobalt chloride paper turns pink. B Measure its boiling point which is 100 °C. C Measure its melting point which is 0 °C. D Pink cobalt chloride paper turns blue.

1 marks

Answer: A

This question in 0653/13 Oct/Nov 2015

20 Dilute hydrochloric acid is added to solid X. Hydrogen gas is produced. dilute hydrochloric acid solid X What is X? A zinc B zinc carbonate C zinc hydroxide D zinc oxide

1 marks

Answer: A

This question in 0653/11 May/June 2016

21 Which test is used to identify ammonia? A A glowing splint relights. B Damp blue litmus paper is bleached. C Damp red litmus paper turns blue. D Limewater turns milky.

1 marks

Answer: C

This question in 0653/11 May/June 2016

25 A colourless liquid is tested with blue cobalt chloride paper. The paper turns pink. Which statement about the liquid must be correct? A It contains water. B It is acidic. C It is anhydrous. D It is pure water.

1 marks

Answer: A

This question in 0653/11 May/June 2016

21 The results of two tests on substance Q are shown. tests results add dilute hydrochloric bubbles of colourless gas, R, acid to solid Q which turns limewater milky add aqueous sodium green precipitate hydroxide to a solution of Q Which cation is present in Q and what is gas R? cation present in Q gas R A iron(II) carbon dioxide B iron(II) chlorine C iron(III) carbon dioxide D iron(III) chlorine

1 marks

Answer: A

This question in 0653/12 May/June 2016

25 What is a chemical test for water? A It boils at 100 °C. B It turns blue cobalt chloride paper pink. C It turns blue copper sulfate crystals white. D It turns pink litmus paper blue.

1 marks

Answer: B

This question in 0653/12 May/June 2016

21 The results of two tests on a solution of substance R are shown. tests results add aqueous red brown precipitate formed, sodium hydroxide insoluble in excess dilute nitric acid added white precipitate formed followed by silver nitrate solution What is R? A iron(II) carbonate B iron(III) carbonate C iron(II) chloride D iron(III) chloride

1 marks

Answer: D

This question in 0653/13 May/June 2016

23 Solution X is mixed with nitric acid and aqueous barium nitrate. A white precipitate is formed. Which ion is present in solution X? A carbonate B chloride C nitrate D sulfate

1 marks

Answer: D

This question in 0653/11 Oct/Nov 2016

23 A mixture of ammonium carbonate and ammonium chloride is heated with aqueous sodium hydroxide. Which gas is produced? A ammonia B carbon dioxide C chlorine D hydrogen chloride

1 marks

Answer: A

This question in 0653/12 Oct/Nov 2016

23 A piece of damp blue litmus paper is placed in a gas. The litmus paper turns red and then turns white. What is the gas? A carbon dioxide B chlorine C hydrogen D oxygen

1 marks

Answer: B

This question in 0653/13 Oct/Nov 2016

23 Which aqueous reagents give a white precipitate when added to aqueous zinc chloride? sodium barium silver hydroxide nitrate nitrate v v v 0 Oo WwW > v v x v x v x v v

1 marks

Answer: C

This question in 0653/12 Feb/March 2017

26 Which chemical test shows the presence of water? A Water has a boiling point of 100 °C. B Water has a freezing point of 0 °C. C Water turns anhydrous cobalt chloride from blue to pink. D Water turns anhydrous copper sulfate from blue to white.

1 marks

Answer: C

This question in 0653/12 Feb/March 2017

22 Acidified barium nitrate solution is added to solution X. A white precipitate forms. What is X? A hydrochloric acid B limewater C potassium chloride D sulfuric acid

1 marks

Answer: D

This question in 0653/11 May/June 2017

17 A molten compound X is electrolysed as shown. lamp anode + – cathode X heat A brown gas is produced at the anode and a grey metal is produced at the cathode. What is X? A aluminium oxide B copper chloride C lead(II) bromide D sodium chloride

1 marks

Answer: C

This question in 0653/12 May/June 2017

22 Substance X is warmed with aqueous sodium hydroxide and aluminium. A gas is produced which turns damp red litmus paper blue. Which anion is present in X? A carbonate B hydroxide C nitrate D sulfate

1 marks

Answer: C

This question in 0653/12 May/June 2017

22 Substance X is warmed with aqueous sodium hydroxide and aluminium. A gas is produced which turns damp red litmus paper blue. Which anion is present in X? A carbonate B hydroxide C nitrate D sulfate

1 marks

Answer: C

This question in 0653/13 May/June 2017

22 Excess magnesium is added to dilute hydrochloric acid containing Universal Indicator. The indicator changes colour and a gas is given off. The gas is tested with limewater. Which row describes the colour change and the result of the limewater test? colour change result of the limewater test A blue to green limewater becomes cloudy B blue to green no change C red to green limewater becomes cloudy D red to green no change

1 marks

Answer: D

This question in 0653/11 Oct/Nov 2017

22 A solution of compound X produces a dark green precipitate when aqueous sodium hydroxide is added. What is X? A copper(II) chloride B copper(II) sulfate C iron(II) sulfate D iron(III) chloride

1 marks

Answer: C

This question in 0653/12 Oct/Nov 2017

22 Separate samples of the gases ammonia, carbon dioxide, chlorine and hydrogen are tested with damp red litmus paper. How many of these gases turn the litmus paper blue? A 1 B 2 C 3 D 4

1 marks

Answer: A

This question in 0653/13 Oct/Nov 2017

22 Aqueous ammonia is added to a solution containing a salt. A white precipitate is produced which dissolves in excess aqueous ammonia. Which ion is present in the salt? A iron(II) B iron(III) C ammonium D zinc

1 marks

Answer: D

This question in 0653/11 May/June 2018

22 Which chemicals are used in the test for nitrate ions? A aqueous barium nitrate and dilute nitric acid B aqueous silver nitrate and dilute nitric acid C dilute acid and limewater D aqueous sodium hydroxide and aluminium

1 marks

Answer: D

This question in 0653/12 May/June 2018

22 Which chemicals are used in the test for nitrate ions? A aqueous barium nitrate and dilute nitric acid B aqueous silver nitrate and dilute nitric acid C dilute acid and limewater D aqueous sodium hydroxide and aluminium

1 marks

Answer: D

This question in 0653/13 May/June 2018

21 The results of two tests on solid P are shown. test result 1 add aqueous sodium hydroxide gas given off that turns moist red to solid litmus paper blue 2 dissolve solid in water white precipitate formed add dilute aqueous silver nitrate What is P? A aluminium carbonate B aluminium sulfate C ammonium chloride D ammonium nitrate

1 marks

Answer: C

This question in 0653/11 Oct/Nov 2018

26 What is a chemical test for water? A Add blue cobalt chloride paper. B Add blue copper sulfate crystals. C Measure the density. D Measure the melting point.

1 marks

Answer: A

This question in 0653/12 Oct/Nov 2018

22 The results of two tests on a white solid are shown. test result 1 add aqueous sodium hydroxide white precipitate formed 2 add dilute hydrochloric acid colourless gas formed What is the white solid? A iron(II) carbonate B iron(II) chloride C zinc carbonate D zinc chloride

1 marks

Answer: C

This question in 0653/13 Oct/Nov 2018

21 A solution is tested for the presence of cations. test result add excess aqueous ammonia green precipitate Which cation is present? A Cu2+ B Fe2+ C Fe3+ D Zn2+

1 marks

Answer: B

This question in 0653/12 Feb/March 2019

21 Which aqueous ion gives a white precipitate with aqueous sodium hydroxide and with aqueous ammonia? A Cu2+ B Fe2+ C Fe3+ D Zn2+

1 marks

Answer: D

This question in 0653/11 May/June 2019

21 Which aqueous ion gives a white precipitate with aqueous sodium hydroxide and with aqueous ammonia? A Cu2+ B Fe2+ C Fe3+ D Zn2+

1 marks

Answer: D

This question in 0653/12 May/June 2019

17 Concentrated aqueous sodium chloride is electrolysed using the apparatus shown. power supply + – damp blue litmus damp blue litmus aqueous sodium chloride A piece of damp blue litmus paper is held above each electrode. Which row shows what happens to the colour of the litmus paper during the electrolysis? positive electrode negative electrode A litmus is unchanged litmus is unchanged B litmus is unchanged litmus turns white C litmus turns white litmus is unchanged D litmus turns white litmus turns white

1 marks

Answer: C

This question in 0653/13 May/June 2019

21 Which aqueous ion gives a white precipitate with aqueous sodium hydroxide and with aqueous ammonia? A Cu2+ B Fe2+ C Fe3+ D Zn2+

1 marks

Answer: D

This question in 0653/13 May/June 2019

7 Which chemical can be identified using limewater? A carbon dioxide B glucose C oxygen D water

1 marks

Answer: A

This question in 0653/12 Feb/March 2020

21 A solution of compound X produces a dark green precipitate when aqueous sodium hydroxide is added. What is X? A copper(II) chloride B copper(II) sulfate C iron(II) sulfate D iron(III) chloride

1 marks

Answer: C

This question in 0653/12 Feb/March 2020

23 Solution X is mixed with nitric acid and aqueous barium nitrate. A white precipitate is formed. Which ion is present in solution X? A carbonate B chloride C nitrate D sulfate

1 marks

Answer: D

This question in 0653/11 May/June 2020

22 Acid X reacts with metal Y. A colourless gas is given off and a pale green solution is produced. Two tests are carried out on the solution. test reagent(s) added result 1 aqueous silver nitrate and nitric acid white precipitate 2 aqueous sodium hydroxide green precipitate What are acid X and metal Y? acid metal A hydrochloric iron B hydrochloric zinc C sulfuric iron D sulfuric zinc

1 marks

Answer: A

This question in 0653/11 Oct/Nov 2020

22 Acid X reacts with metal Y. A colourless gas is given off and a pale green solution is produced. Two tests are carried out on the solution. test reagent(s) added result 1 aqueous silver nitrate and nitric acid white precipitate 2 aqueous sodium hydroxide green precipitate What are acid X and metal Y? acid metal A hydrochloric iron B hydrochloric zinc C sulfuric iron D sulfuric zinc

1 marks

Answer: A

This question in 0653/12 Oct/Nov 2020

22 Acid X reacts with metal Y. A colourless gas is given off and a pale green solution is produced. Two tests are carried out on the solution. test reagent(s) added result 1 aqueous silver nitrate and nitric acid white precipitate 2 aqueous sodium hydroxide green precipitate What are acid X and metal Y? acid metal A hydrochloric iron B hydrochloric zinc C sulfuric iron D sulfuric zinc

1 marks

Answer: A

This question in 0653/13 Oct/Nov 2020

20 A mixture of ammonium carbonate and ammonium chloride is heated with aqueous sodium hydroxide. Which gas is produced? A ammonia B carbon dioxide C chlorine D hydrogen chloride

1 marks

Answer: A

This question in 0653/12 Feb/March 2021

21 The diagram shows what happens when damp red litmus paper is placed into two different gases, X and Y. gas gas X Y red litmus paper red litmus paper turns blue turns white What are gases X and Y? X Y A ammonia carbon dioxide B ammonia chlorine C chlorine ammonia D chlorine carbon dioxide

1 marks

Answer: B

This question in 0653/12 Feb/March 2021

20 Which two substances form a white precipitate when they are mixed? A barium chloride and hydrochloric acid B barium chloride and nitric acid C silver nitrate and hydrochloric acid D silver nitrate and nitric acid

1 marks

Answer: C

This question in 0653/11 May/June 2021

8 What can be 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 0653/12 May/June 2021

20 Which two substances form a white precipitate when they are mixed? A barium chloride and hydrochloric acid B barium chloride and nitric acid C silver nitrate and hydrochloric acid D silver nitrate and nitric acid

1 marks

Answer: C

This question in 0653/12 May/June 2021

20 Which two substances form a white precipitate when they are mixed? A barium chloride and hydrochloric acid B barium chloride and nitric acid C silver nitrate and hydrochloric acid D silver nitrate and nitric acid

1 marks

Answer: C

This question in 0653/13 May/June 2021

23 A piece of damp blue litmus paper is placed in a gas. The litmus paper turns red and then turns white. What is the gas? A carbon dioxide B chlorine C hydrogen D oxygen

1 marks

Answer: B

This question in 0653/11 Oct/Nov 2021

23 What is used to identify chlorine? A a glowing splint B a lighted splint C damp litmus paper D limewater

1 marks

Answer: C

This question in 0653/12 Feb/March 2022

23 The results of two tests on substance Q are shown. test result add dilute hydrochloric acid bubbles of colourless gas, R, to solid Q which turns limewater milky add aqueous sodium hydroxide green precipitate to a solution of Q Which cation is present in Q and what is gas R? cation present in Q gas R A iron(II) carbon dioxide B iron(II) chlorine C iron(III) carbon dioxide D iron(III) chlorine

1 marks

Answer: A

This question in 0653/11 May/June 2022

23 The results of two tests on substance Q are shown. test result add dilute hydrochloric acid bubbles of colourless gas, R, to solid Q which turns limewater milky add aqueous sodium hydroxide green precipitate to a solution of Q Which cation is present in Q and what is gas R? cation present in Q gas R A iron(II) carbon dioxide B iron(II) chlorine C iron(III) carbon dioxide D iron(III) chlorine

1 marks

Answer: A

This question in 0653/12 May/June 2022

23 The results of two tests on substance Q are shown. test result add dilute hydrochloric acid bubbles of colourless gas, R, to solid Q which turns limewater milky add aqueous sodium hydroxide green precipitate to a solution of Q Which cation is present in Q and what is gas R? cation present in Q gas R A iron(II) carbon dioxide B iron(II) chlorine C iron(III) carbon dioxide D iron(III) chlorine

1 marks

Answer: A

This question in 0653/13 May/June 2022

21 Which pair of gases can be identified using damp litmus paper and limewater? A carbon dioxide and hydrogen B chlorine and carbon dioxide C chlorine and oxygen D hydrogen and chlorine

1 marks

Answer: B

This question in 0653/11 Oct/Nov 2022

21 Which pair of gases can be identified using damp litmus paper and limewater? A carbon dioxide and hydrogen B chlorine and carbon dioxide C chlorine and oxygen D hydrogen and chlorine

1 marks

Answer: B

This question in 0653/12 Oct/Nov 2022

21 Which pair of gases can be identified using damp litmus paper and limewater? A carbon dioxide and hydrogen B chlorine and carbon dioxide C chlorine and oxygen D hydrogen and chlorine

1 marks

Answer: B

This question in 0653/13 Oct/Nov 2022

19 Which solid reacts with sulfuric acid to produce a gas? A copper B copper carbonate C copper oxide D copper sulfate

1 marks

Answer: B

This question in 0653/12 Feb/March 2023

24 Which colour change is seen when water is added to anhydrous cobalt(II) chloride? A white to blue B pink to blue C blue to white D blue to pink

1 marks

Answer: D

This question in 0653/12 Feb/March 2023

22 The results of two tests on a solution of substance R are shown. test result aqueous sodium red-brown precipitate formed, hydroxide added insoluble in excess dilute nitric acid added followed by aqueous white precipitate formed silver nitrate added What is R? A iron(II) carbonate B iron(III) carbonate C iron(II) chloride D iron(III) chloride

1 marks

Answer: D

This question in 0653/11 May/June 2023

22 The results of two tests on solid P are shown. test result 1 add aqueous gas given off that turns sodium hydroxide to solid moist red litmus paper blue 2 dissolve solid in water, white precipitate formed add dilute aqueous silver nitrate What is P? A aluminium carbonate B aluminium sulfate C ammonium chloride D ammonium nitrate

1 marks

Answer: C

This question in 0653/12 May/June 2023

26 Four substances are listed. 1 aqueous sodium sulfate 2 dilute sulfuric acid 3 solid iodine 4 white copper(II) sulfate Which substances turn cobalt(II) chloride from blue to pink? A 1 and 2 B 1 and 4 C 2 and 3 D 3 and 4

1 marks

Answer: A

This question in 0653/12 May/June 2023

23 The results of two tests on a white solid are shown. test result 1 add aqueous sodium hydroxide white precipitate formed 2 add dilute hydrochloric acid colourless gas formed What is the white solid? A iron(II) carbonate B iron(II) chloride C zinc carbonate D zinc chloride

1 marks

Answer: C

This question in 0653/13 May/June 2023

8 Which chemical is used to test for carbon dioxide in expired air? A Benedict’s solution B distilled water C iodine solution D limewater

1 marks

Answer: D

This question in 0653/11 Oct/Nov 2023

21 Acid X reacts with metal Y. A colourless gas is given off and a pale green solution is produced. Two tests are carried out on the solution. test reagents added result 1 aqueous silver nitrate and dilute nitric acid white precipitate 2 aqueous sodium hydroxide green precipitate What are acid X and metal Y? acid X metal Y A hydrochloric iron B hydrochloric zinc C sulfuric iron D sulfuric zinc

1 marks

Answer: A

This question in 0653/11 Oct/Nov 2023

7 A student is investigating the differences in composition of samples of inspired and expired air. What can he use to test for carbon dioxide? A biuret solution B limewater C ethanol D iodine solution

1 marks

Answer: B

This question in 0653/12 Oct/Nov 2023

21 Which test is used to identify ammonia? A A glowing splint relights. B Damp blue litmus paper is bleached. C Damp red litmus paper turns blue. D Limewater turns milky.

1 marks

Answer: C

This question in 0653/12 Oct/Nov 2023

7 A student is investigating the differences in composition of samples of inspired and expired air. What can he use to test for carbon dioxide? A biuret solution B limewater C ethanol D iodine solution

1 marks

Answer: B

This question in 0653/13 Oct/Nov 2023

21 Which test is used to identify ammonia? A A glowing splint relights. B Damp blue litmus paper is bleached. C Damp red litmus paper turns blue. D Limewater turns milky.

1 marks

Answer: C

This question in 0653/13 Oct/Nov 2023

20 When solid Q is added to dilute hydrochloric acid, a gas is collected. This gas ‘pops’ when tested with a lighted splint. gas gas syringe Q dilute hydrochloric acid What is Q? A magnesium B magnesium carbonate C magnesium chloride D magnesium oxide

1 marks

Answer: A

This question in 0653/12 Feb/March 2024

20 A mixture of ammonium carbonate and ammonium chloride is heated with aqueous sodium hydroxide. Which gas is produced? A ammonia B carbon dioxide C chlorine D hydrogen chloride

1 marks

Answer: A

This question in 0653/11 May/June 2024

22 Compound X reacts with dilute nitric acid to give a colourless gas which turns limewater milky. An aqueous solution of X reacts with aqueous sodium hydroxide to form a light blue precipitate. What is X? A copper(II) carbonate B copper(II) chloride C iron(II) carbonate D iron(II) chloride

1 marks

Answer: A

This question in 0653/12 May/June 2024

23 Which row identifies the correct test and test result for the named gases? chlorine ammonia oxygen A turns damp turns damp ‘pops’ with litmus paper blue litmus paper red a lighted splint B turns damp turns damp ‘pops’ with litmus paper red litmus paper blue a lighted splint C bleaches damp turns damp relights a litmus paper litmus paper blue glowing splint D bleaches damp turns damp relights a litmus paper litmus paper red glowing splint

1 marks

Answer: C

This question in 0653/13 May/June 2024

21 A solution of compound X produces a green precipitate when aqueous sodium hydroxide is added. What is X? A copper(II) chloride B copper(II) sulfate C iron(II) sulfate D iron(III) chloride

1 marks

Answer: C

This question in 0653/11 Oct/Nov 2024

24 What is a chemical test for water? A Blue cobalt(II) chloride paper turns pink. B Measure its boiling point which is 100 C. C Measure its melting point which is 0 C. D Pink cobalt(II) chloride paper turns blue.

1 marks

Answer: A

This question in 0653/11 Oct/Nov 2024

26 The results of tests done on three gases, X, Y and Z, are shown. test X Y Z lighted splint burns brighter pops goes out glowing splint relights goes out goes out damp red litmus paper stays red stays red goes blue Which row identifies X, Y and Z? X Y Z A hydrogen oxygen ammonia B hydrogen oxygen chlorine C oxygen hydrogen ammonia D oxygen hydrogen chlorine

1 marks

Answer: C

This question in 0653/12 Feb/March 2025

27 Which observation shows the presence of iron(III) ions? A A blue solution is formed with excess aqueous ammonia. B A green precipitate is formed with aqueous sodium hydroxide. C A red-brown precipitate is formed with aqueous sodium hydroxide. D A white precipitate is formed with aqueous ammonia.

1 marks

Answer: C

This question in 0653/12 Feb/March 2025

27 Separate samples of the gases ammonia, chlorine, hydrogen and oxygen are tested with damp blue litmus paper. How many of these gases change the colour of the litmus paper? A 0 B 1 C 2 D 3

1 marks

Answer: B

This question in 0653/13 May/June 2025

22 The diagram shows two open containers, X and Y, inside a glass tube. Steam passes over the solids in X and Y. glass tube steam X Y X contains anhydrous copper(II) sulfate. Y contains anhydrous cobalt(II) chloride. What is observed? A The solid in X remains blue. B The solid in X turns from white to blue. C The solid in Y turns from pink to blue. D The solid in Y turns from pink to white.

1 marks

Answer: B

This question in 0653/11 Oct/Nov 2025

22 Anhydrous copper(II) sulfate is used to test for water. Which colour does it turn in the presence of water? A white B pink C green D blue

1 marks

Answer: D

This question in 0653/12 Oct/Nov 2025

27 Aqueous ammonia is added to a solution containing a salt. A white precipitate is produced which dissolves in excess aqueous ammonia. Which ion is present in the salt? A ammonium B iron(II) C iron(III) D zinc

1 marks

Answer: D

This question in 0653/12 Oct/Nov 2025

27 Aqueous ammonia is added to a solution containing a salt. A white precipitate is produced which dissolves in excess aqueous ammonia. Which ion is present in the salt? A ammonium B iron(II) C iron(III) D zinc

1 marks

Answer: D

This question in 0653/13 Oct/Nov 2025