Formulae — Paper 1 · IGCSE Chemistry (9-1) 0971

11 The formula of which compound contains the largest number of Group VII atoms? A C13H13IO8 B Cl 2O6 C Al (BrO3)3 D NaFC2H2O2

1 marks

Answer: C

This question in 0971/12 Oct/Nov 2020

8 Methane burns in oxygen to produce carbon dioxide and water. What is the balanced equation for this reaction? A CH4 + 2O2  2CO2 + 2H2O B CH4 + 2O2  CO2 + 2H2O C CH4 + 2O2  CO2 + H2O D CH4 + O2  CO2 + 2H2O

1 marks

Answer: B

This question in 0971/11 May/June 2021

33 A chemical equation for the complete combustion of methane is shown. 2CH4 + zO2  2CO2 + 4H2O What is the value of z? A 2 B 3 C 4 D 6

1 marks

Answer: C

This question in 0971/12 Oct/Nov 2021

9 Which equation for the decomposition of calcium nitrate is correct? A Ca(NO3)2  CaO + NO2 + O2 B Ca(NO3)2  CaO + 2NO2 + O2 C 2Ca(NO3)2  2CaO + 2NO2 + O2 D 2Ca(NO3)2  2CaO + 4NO2 + O2

1 marks

Answer: D

This question in 0971/11 May/June 2022

38 A molecule of compound P contains two carbon atoms and four hydrogen atoms. Which row represents P? name of M reacts with compound " aqueous bromine A ethane 30 x B ethene 16 v Cc ethene 28 v D ethene 28 x

1 marks

Answer: C

This question in 0971/11 May/June 2022

9 A compound of element X has the formula X2O and a relative formula mass of 144. What is element X? A copper, Cu B gadolinium, Gd C sulfur, S D tellurium, Te

1 marks

Answer: A

This question in 0971/12 May/June 2022

8 Caffeine is a stimulant found in coffee. O CH3 H3C C N N C C H C C N O N CH3 caffeine Which formula represents caffeine? A C7H10N4O2 B C8H10N3O2 C C8H10N4O2 D C8H11N4O2

1 marks

Answer: C

This question in 0971/12 Oct/Nov 2022

7 Sodium burns in oxygen to form sodium oxide. What is the balanced equation for the reaction? A 4Na + 2O → 2Na2O B 4Na + O2 → 2Na2O C 2Na2 + O2 → 2Na2O D 2Na2 + 2O → 2Na2O

1 marks

Answer: B

This question in 0971/12 May/June 2023

8 Iron(III) oxide is reduced by carbon monoxide to produce iron and carbon dioxide. What is the balanced equation for this reaction? A Fe2O3 + 2CO →2Fe + 2CO2 B Fe2O3 + 3CO →2Fe + 3CO2 C 2Fe2O3 + 6CO →2Fe + 6CO2 D 2Fe2O3 + 3CO →4Fe + 3CO2

1 marks

Answer: B

This question in 0971/11 May/June 2024

10 Which row shows the correct formulae of lead(II) bromide and butane? lead(II) bromide butane A PbBr2 C4H8 B PbBr2 C4H10 C Pb2Br C4H8 D Pb2Br C4H10

1 marks

Answer: B

This question in 0971/12 May/June 2024

11 Calcium phosphate forms when calcium chloride and sodium phosphate solutions react together. x CaCl 2 + y Na3PO4 → 2Ca3(PO4)2 + 12NaCl Which values of x and y balance the equation? x y A 2 2 B 3 4 C 6 3 D 6 4

1 marks

Answer: D

This question in 0971/12 May/June 2024

9 Which symbol equation represents the reaction between aqueous sodium hydroxide and dilute sulfuric acid? A Na2OH + H2SO4  2NaSO4 + H2O B Na(OH)2 + H2SO4  Na2SO4 + 2H2O C 2NaOH + H2SO4  2NaSO4 + 2H2O D 2NaOH + H2SO4  Na2SO4 + 2H2O

1 marks

Answer: D

This question in 0971/12 Oct/Nov 2024

9 Which row shows the correct formula for the named substance? substance formula A cobalt(II) chloride Cu2Cl B sodium carbonate Na2CO3 C xenon Xe2 D ammonium sulfate NH4SO4

1 marks

Answer: B

This question in 0971/11 May/June 2025