Question 1

One of the reactions taking place in a catalytic converter in a car exhaust system is between nitrogen oxide and octane (unburned petrol). The products of this reaction are non-toxic.

Which is the correct equation for the reaction?

  A  

C8H16 + 16NO ➔ 8CO + 8N2 + 8H2O

  B  

C8H16 + 24NO ➔ 8CO2 + 12N2 + 8H2O

  C  

C8H18 + 17NO ➔ 8CO2 + 8.5N2 + 9H2O

  D  

C8H18 + 25NO ➔ 8CO2 + 12.5N2 + 9H2O

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Question 2

Nitrogen monoxide, NO, is a primary pollutant produced by petrol engines and is found in their exhaust gases.

Which reaction occurs in a catalytic converter and decreases the emission of nitrogen monoxide?

  A  

NO(g) + CO(g) ➔ NO2(g) + C(s)

  B  

NO(g) + CO2(g) ➔ NO2(g) + CO(g)

  C  

2NO(g) + 2CO(g) ➔ N2(g) + 2CO2(g)

  D  

2NO(g) + CO2(g) ➔ 2NO2(g) + C(s)

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Question 3

The first step in the reaction between chlorine and ethane involves

  A  

heterolytic bond breaking

  B  

homolytic bond breaking

  C  

electrophilic attack by chlorine

  D  

nucleophilic attack by chlorine

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Question 4

The hydrocarbon C17H36 can be cracked.

Which compound is the least likely to be produced in this reaction?

  A  

C3H8

  B  

C4H8

  C  

C8H16

  D  

C16H34

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Question 5

How many structural isomers are there of molecular formula C5H10O that give a red precipitate with Fehling’s solution?

  A  

1

  B  

2

  C  

3

  D  

4

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Question 6

Which fuel would produce the largest mass of CO2 when 10 kg of the fuel undergo complete combustion?

  A  

biodiesel, C17H34O2

  B  

ethanol, C2H6O

  C  

octane, C8H18

  D  

propane, C3H8

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Question 7

This question is about the reaction of methane with bromine in sunlight.

CH4 + Br2 ➔ CH3Br + HBr

This reaction is best described as

  A  

electrophilic addition

  B  

electrophilic substitution

  C  

free radical addition

  D  

free radical substitution

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Question 8

Which property explains the low reactivity of alkanes?

  A  

electron pair repulsion between σ-bonds

  B  

free rotation about σ-bonds

  C  

high C-C bond enthalpy

  D  

high polarity of the C-H bonds

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Question 9

Which alkane has the highest boiling point?

  A  

CH3(CH2)5CH3


  B  

(CH3)3CCH(CH3)2


  C  

CH3(CH2)3CH(CH3)2


  D  

(CH3)2CHCH2CH(CH3)2


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Question 10

1 mol of a compound reacts with 8 mol O2 for complete combustion.

What is the formula of the compound?

  A  

C4H8

  B  

C4H9OH

  C  

C5H11OH

  D  

C5H12

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Question 11

Tetradecane (C14H30) is an alkane found in crude oil.

When tetradecane is heated to a high temperature, one molecule of tetradecane decomposes to form one molecule of hexane and three more molecules.

Which of the following could represent this reaction?

  A  

C14H30 ➔ C6H14 + C4H8 + 2C2H4

  B  

C14H30 ➔ C6H14 + C6H12 + C2H4

  C  

C14H30 ➔ C5H12 + 3C3H6

  D  

C14H30 ➔ C6H14 + C2H6 + 2C3H6

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Question 12

An excess of methane reacts with chlorine in the presence of ultraviolet radiation.

What are the main products of this reaction?

  A  

CCl4 and H2

  B  

CCl4 and HCl

  C  

CH3Cl and H2

  D  

CH3Cl and HCl

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Question 13

Which statement is correct about the fractional distillation of crude oil?

  A  

a zeolite catalyst is used

  B  

each fraction contains a mixture of hydrocarbons

  C  

gaseous fractions are formed by breaking covalent bonds

  D  

the fractionating column is hottest at the top

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