Home / iGCSE Chemistry Multiple Choice (Extended) : 11.3 Fuels: Exam Style Questions Paper 2

iGCSE Chemistry Multiple Choice (Extended) : 11.3 Fuels: Exam Style Questions Paper 2

iGCSE Chemistry MCQ (Extended) Paper 2 - All Chapters
Question

Which fraction obtained from petroleum has the lowest boiling point?

A) diesel oil
B) fuel oil
C) kerosene
D) naphtha

▶️ Answer/Explanation
Solution

Ans: D

In fractional distillation of petroleum, fractions are separated based on their boiling points, with the lowest boiling point fractions collected at the top of the fractionating column. The order from lowest to highest boiling point is:

1. Refinery gases (not listed)

2. Gasoline/petrol (not listed)

3. Naphtha (D) – lowest boiling point among the options

4. Kerosene (C)

5. Diesel oil (A)

6. Fuel oil (B) – highest boiling point among the options

Therefore, naphtha has the lowest boiling point among the given choices.

Question

Which statement is correct?

A) Bitumen is used as a fuel for ships.
B) Coal, natural gas and oxygen are all fuels.
C) Hydrogen is the main constituent of natural gas.
D) Petroleum is separated into useful substances by fractional distillation.

▶️ Answer/Explanation
Solution

Ans: D

Let’s analyze each option:

A) Incorrect – Bitumen is too viscous and is primarily used for road surfacing, not as ship fuel.

B) Incorrect – While coal and natural gas are fuels, oxygen is an oxidizer, not a fuel.

C) Incorrect – The main constituent of natural gas is methane (CH4), not hydrogen.

D) Correct – Petroleum (crude oil) is indeed separated into useful fractions (like gasoline, diesel, kerosene) through fractional distillation in oil refineries. This process takes advantage of the different boiling points of the hydrocarbon components.

Fractional distillation works by heating crude oil to vaporize it, then allowing it to condense at different temperatures in a fractionating column, with lighter fractions (lower boiling points) collected at the top and heavier fractions at the bottom.

Question

 Which statement about fuels is correct?

A. Heat energy is only produced by burning fuels.
B. Hydrogen is used as a fuel although it is difficult to store.
C. Methane is a good fuel because it produces only water when burned.
D. Uranium is burned in air to produce energy.

Answer/Explanation

Ans:

B

Question

The pie chart represents the composition of natural gas.
Which sector represents methane?

Answer/Explanation

Ans: D

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