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Dilute acid is poured on sodium carbonate. The gas released turns lime water milky. It is:
ACarbon dioxide
BCarbon monoxide
CSulphur dioxide
DHydrogen sulphide
Answer & Solution
Correct answer: A. Carbon dioxide
1. Carbonates react with acids to give salt, water and a gas.
2. That gas turns lime water milky.
3. So the gas is carbon dioxide.
_Source: syllabus Science Class X, Chapter 2, Acids, Bases and Salts._
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