O-LevelChemistryAtomic Structure5070/11 · Oct/Nov 2025 · Q31 Mark

The main component of mineral X is calcium carbonate, CaCO3. X also contains tiny grains of silicon(IV) oxide, SiO2. There are no other substances in X. Which row shows two correct statements about X?

AX is a compound X contains exactly four different elements

BX is a compound X contains exactly five different elements

CX is a mixture X contains exactly four different elements

DX is a mixture X contains exactly five different elements

✓ Correct answer

C: X is a mixture X contains exactly four different elements

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Topic: Atomic Structure, O-Level Chemistry (syllabus 5070). Multiple choice, 1 mark.
Source: O-Level Chemistry, Oct/Nov 2025 Paper 1 Variant 1, question 3.

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