O-LevelChemistryChemistry of the Environment5070/11 · May/June 2025 · Q311 Mark

Three statements about global warming and greenhouse gases are listed. 1 Global warming is occurring because more of the Earth's thermal energy is released to space. 2 Greenhouse gases both absorb and emit thermal energy. 3 Greenhouse gas levels in the atmosphere may be reduced by replacing fossil fuels with hydrogen. Which statements are correct?

A1, 2 and 3

B1 and 2 only

C1 and 3 only

D2 and 3 only

✓ Correct answer

D: 2 and 3 only

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Topic: Chemistry of the Environment, O-Level Chemistry (syllabus 5070). Multiple choice, 1 mark.
Source: O-Level Chemistry, May/June 2025 Paper 1 Variant 1, question 31.

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