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A-LevelChemistryGroup 29701/12 · Oct/Nov 2015 · Q51 Mark

Calcium forms an ionic compound with carbon, called calcium carbide. The oxidation number of carbon in calcium carbide is –1. Calcium carbide is readily hydrolysed by water giving two products only. What could be the formulae of calcium carbide and the two products of hydrolysis?

Acalcium carbide: Ca2C, products: CaO and C2H4

Bcalcium carbide: Ca2C, products: Ca(OH)2 and C2H2

Ccalcium carbide: CaC2, products: CaO and C2H4

Dcalcium carbide: CaC2, products: Ca(OH)2 and C2H2

✓ Correct answer

D: calcium carbide: CaC2, products: Ca(OH)2 and C2H2

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About this question

Topic: Group 2, A-Level Chemistry (syllabus 9701). Multiple choice, 1 mark.
Source: A-Level Chemistry, Oct/Nov 2015 Paper 1 Variant 2, question 5.

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