Fuels — Paper 2 · IGCSE Sciences - Co-ordinated (9-1) 0973

26 The diagram represents the fractional distillation of petroleum. Four fractions, W, X, Y and Z, are produced. W X Y Z petroleum Which statement about fraction Y is correct? A The forces of attraction between molecules in Y are smaller than those in W. B The molecules in Y are smaller than the molecules in Z. C Y has a lower boiling point than X. D Y vapourises more readily at room temperature than W and X, but less readily than Z.

1 marks

Answer: B

This question in 0973/22 May/June 2020

24 Which row shows the conditions used in the Haber process? temperature / C pressure / atm catalyst A 150 200 iron B 150 400 vanadium oxide C 450 200 iron D 450 400 vanadium oxide

1 marks

Answer: C

This question in 0973/21 Oct/Nov 2020

25 The Contact process is used to manufacture sulfuric acid. Which statement about the Contact process is not correct? A A nickel catalyst is used. B Sulfur dioxide reacts with oxygen to form sulfur trioxide. C Sulfur burns to form sulfur dioxide. D Sulfur trioxide dissolves in concentrated sulfuric acid to form oleum.

1 marks

Answer: A

This question in 0973/21 Oct/Nov 2020

27 The cracking of decane molecules is represented by the equation shown. C10H22  Y + 2C3H6 What is Y? A C4H8 B C4H10 C C7H14 D C7H16

1 marks

Answer: B

This question in 0973/21 Oct/Nov 2021

23 Which row describes how hydrogen and nitrogen are obtained for use in the Haber process? hydrogen nitrogen A electrolysis of sulfuric acid catalytic reduction of nitrogen oxides B electrolysis of sulfuric acid distillation of air C reaction of methane and steam catalytic reduction of nitrogen oxides D reaction of methane and steam distillation of air

1 marks

Answer: D

This question in 0973/21 May/June 2023

26 Petroleum is separated into fractions by fractional distillation. Information about uses of some fractions and positions in the fractionating column where they are collected is shown. fraction use position 1 gasoline making roads below refinery gas 2 bitumen petrol for car engines bottom of column 3 naphtha making chemicals below gasoline 4 refinery gas heating and cooking top of column Which rows are correct? A 1 and 2 B 1 and 4 C 2 and 3 D 3 and 4

1 marks

Answer: D

This question in 0973/21 May/June 2023

26 Naphtha is obtained by the fractional distillation of petroleum. Which statements about naphtha are correct? 1 It burns to form carbon dioxide and water. 2 It is a mixture of hydrocarbons. 3 It is present in bottled gas. 4 The main component of naphtha is methane. A 1 and 2 B 1 and 4 C 2 and 3 D 3 and 4

1 marks

Answer: A

This question in 0973/22 May/June 2023

25 Which statements about the Haber process are correct? 1 The hydrogen used is obtained from the air. 2 The pressure used is about twice atmospheric pressure. 3 The catalyst used is iron. 4 The process takes place at a temperature of about 450 C. A 1 and 2 B 1 and 4 C 2 and 3 D 3 and 4

1 marks

Answer: D

This question in 0973/21 May/June 2024

26 Large alkane molecules are cracked to form smaller molecules. Which equations represent cracking reactions? 1 C18H38  2C6H14 + C6H12 2 C18H38  H2 + 3C6H12 3 C15H32  C5H10 + 2C5H12 4 C15H32  C6H14 + C5H10 + C4H8 A 1 and 3 B 1 and 4 C 2 and 3 D 2 and 4

1 marks

Answer: D

This question in 0973/22 May/June 2025

23 Gasoline and diesel oil are fractions obtained by the fractional distillation of petroleum. Which row about gasoline and diesel oil is correct? temperature at which size of molecules the fraction is collected in the fraction A gasoline higher than diesel oil gasoline larger than diesel oil B gasoline higher than diesel oil gasoline smaller than diesel oil C diesel oil higher than gasoline diesel oil larger than gasoline D diesel oil higher than gasoline diesel oil smaller than gasoline

1 marks

Answer: C

This question in 0973/21 Oct/Nov 2025