alleryWhen a carbonate reacts with an acid, the gas evolved is:
AHydrogen
BOxygen
CCarbon dioxide
DNitrogen
Answer & Solution
Correct answer: C. Carbon dioxide
1. Carbonate (or bicarbonate) + acid → salt + water + CO₂.
2. Na₂CO₃ + 2 HCl → 2 NaCl + H₂O + CO₂↑.
3. CO₂ turns lime water (Ca(OH)₂) MILKY — diagnostic test.
_Source: syllabus Science Ch 2 §2.1.2 Acids with Carbonates_
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