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NCERT · Class 10 · Science · Acids, Bases and SaltsWhen dilute hydrochloric acid reacts with sodium carbonate, which gas is evolved?

Step-by-Step Solution

Correct Option: C

When an acid reacts with a metal carbonate or metal bicarbonate, it produces salt, water, and carbon dioxide gas. The chemical equation for this reaction is: Na₂CO₃(s) + 2HCl(aq) → 2NaCl(aq) + H₂O(l) + CO₂(g)↑. The evolved carbon dioxide gas can be confirmed by passing it through lime water, which turns milky due to the formation of calcium carbonate precipitate.

Detailed Options Breakdown
Option : Hydrogen

Incorrect choice. This distractor represents a common misunderstanding of the core principles of Acids, Bases and Salts.

Option 1: Oxygen

Incorrect choice. This distractor represents a common misunderstanding of the core principles of Acids, Bases and Salts.

Option 2: Carbon dioxide (Correct Answer)

Correct choice. Refer to the step-by-step verified solution guidelines above for details.

Option 3: Chlorine

Incorrect choice. This distractor represents a common misunderstanding of the core principles of Acids, Bases and Salts.

💡 Study Guide: This question tests core syllabus concepts from Acids, Bases and Salts. For formulas, key summaries, and mock exam reference guides, read the full Acids, Bases and Salts Revision Notes.
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