O-LevelChemistryChemistry of the Environment5070/12 · May/June 2015 · Q331 Mark

A diagram of a biogas generator is shown. The gas, if collected, can be used as a fuel. However, if the gas is allowed to escape it becomes an atmospheric pollutant. What is the gas?

This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.

Acarbon monoxide

Bmethane

Cnitrogen

Dsulfur dioxide

✓ Correct answer

B: methane

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Topic: Chemistry of the Environment, O-Level Chemistry (syllabus 5070). Multiple choice, 1 mark.
Source: O-Level Chemistry, May/June 2015 Paper 1 Variant 2, question 33.

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