alleryWhich gas is released with brisk effervescence when ethanoic acid reacts with sodium carbonate?
AHydrogen gas
BCarbon dioxide
CSulphur dioxide
DMethane gas
Answer & Solution
Correct answer: B. Carbon dioxide
1. Ethanoic acid reacts with carbonates and bicarbonates, which are weak bases.
2. Such acid-carbonate reactions release carbon dioxide with brisk effervescence.
3. Reaction with a metal would give hydrogen, and heating its sodium salt with soda lime gives methane, so those are wrong.
4. With sodium carbonate the gas evolved is carbon dioxide.
_Source: Samacheer Kalvi (TN SCERT) Class 10 Science, Unit 11 "Carbon and its Compounds", p.172_
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