O-LevelChemistryRates of Reaction5070/11 · Oct/Nov 2011 · Q151 Mark

Which pair of statements about the combustion of a carbohydrate and its formation by photosynthesis is not correct?

Acombustion: chemical energy converted to heat energy; photosynthesis: chemical energy converted to light energy

Bcombustion: no catalyst needed; photosynthesis: catalyst needed

Ccombustion: oxygen used up; photosynthesis: oxygen released

Dcombustion: reaction exothermic; photosynthesis: reaction endothermic

✓ Correct answer

A: combustion: chemical energy converted to heat energy; photosynthesis: chemical energy converted to light energy

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Topic: Rates of Reaction, O-Level Chemistry (syllabus 5070). Multiple choice, 1 mark.
Source: O-Level Chemistry, Oct/Nov 2011 Paper 1 Variant 1, question 15.

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