O-LevelChemistryStoichiometry5070/11 · May/June 2024 · Q21 Mark

A sample of substance X contains iron and sulfur only. [Ar: Fe, 56; S, 32] In which row is it possible for both statements about X to be correct?

AX is a mixture with the ratio 4:7 by mass of iron and sulfur; X is a compound with the ratio 4:7 by mass of iron and sulfur

BX is a mixture with the ratio 7:4 by mass of iron and sulfur; X is a compound with the ratio 7:4 by mass of iron and sulfur

CX is a mixture with the formula FeS; X is a compound with the formula FeS

DX is a mixture with the formula FeSO₄; X is a compound with the formula FeSO₄

✓ Correct answer

B: X is a mixture with the ratio 7:4 by mass of iron and sulfur; X is a compound with the ratio 7:4 by mass of iron and sulfur

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Topic: Stoichiometry, O-Level Chemistry (syllabus 5070). Multiple choice, 1 mark.
Source: O-Level Chemistry, May/June 2024 Paper 1 Variant 1, question 2.

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