O-LevelChemistryMetals & Reactivity5070/12 · May/June 2021 · Q201 Mark

Solution X is colourless. A few drops of aqueous potassium iodide solution are added to a sample of X. No change is seen. Solution Y is colourless. A few drops of aqueous acidified potassium manganate(VII) solution are added to a sample of Y. The colour of the potassium manganate(VII) disappears. What can be deduced about X and Y from these two observations?

AX and Y are both reducing agents.

BX is an oxidising agent and Y is not a reducing agent.

CX is not a reducing agent and Y is an oxidising agent.

DX is not an oxidising agent and Y is a reducing agent.

✓ Correct answer

D: X is not an oxidising agent and Y is a reducing agent.

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Topic: Metals & Reactivity, O-Level Chemistry (syllabus 5070). Multiple choice, 1 mark.
Source: O-Level Chemistry, May/June 2021 Paper 1 Variant 2, question 20.

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