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2017 O Level Chem P1 Q29 — Stoichiometry / Reactions Forming CO2 and Water Solution

Stoichiometry / Reactions Forming CO2 and Water 2017 O Level Pure Chemistry · Paper 1 · Q29

Question

Which process does not result in the formation of both carbon dioxide and water?

Aaddition of a dilute acid to a carbonate
Bcomplete combustion of ethanol
Ccomplete combustion of methane
Dgently heating crystals of hydrated sodium carbonate, Na₂CO₃.10H₂O

Correct answer: D

Video Solution

Explanation

Answer: D. Gently heating hydrated sodium carbonate drives off only the water of crystallisation; sodium carbonate itself is stable and does not decompose, so no carbon dioxide is formed.

Each of the others (acid on a carbonate, and complete combustion of ethanol or of methane) produces both carbon dioxide and water.

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