O-LevelChemistryStoichiometry5070/11 · May/June 2013 · Q101 Mark

Which statement most clearly indicates that diamond and graphite are forms of carbon?

ABoth are crystalline solids.

BComplete combustion of equal masses of both solids produces equal masses of carbon dioxide as the only product.

CGraphite conducts electricity whereas diamond is an insulator.

DUnder suitable conditions graphite can be partially converted to diamond.

✓ Correct answer

B: Complete combustion of equal masses of both solids produces equal masses of carbon dioxide as the only product.

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Topic: Stoichiometry, O-Level Chemistry (syllabus 5070). Multiple choice, 1 mark.
Source: O-Level Chemistry, May/June 2013 Paper 1 Variant 1, question 10.

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