Q1. [1] § 3.1 PHYSICAL PROPERTIES § 3.2 CHEMICAL PROPERTIES OF METALS § 3.3 HOW DO METALS AND NON-METALS REACT?
A metal, 'X', on treatment with sodium hydroxide liberates a gas 'G'. It also liberates the same gas, 'G' on treatment with dilute sulphuric acid. Based on above information, 'X' and 'G' respectively are
- A Copper and Sulphur dioxide
- B Zinc and Sulphur dioxide
- C Zinc and Hydrogen
- D Copper and Hydrogen
Previously asked in CBSE board exam
2025 31/5/1 Q4
Generated by claude-sonnet-4-6 · 2026-06-15 06:48 · grounding rag
Model Answer
Option C: Zinc and Hydrogen
Zinc reacts with NaOH to give Na₂ZnO₂ + H₂, and with dilute H₂SO₄ to give ZnSO₄ + H₂. Thus X = Zinc, G = Hydrogen.
Explanation
Zinc is an amphoteric metal — it reacts with both acids and bases to release hydrogen gas. Copper does not react with NaOH or dilute H₂SO₄, so options A and D are eliminated. Sulphur dioxide is not produced in these reactions, eliminating B. Examiners expect you to recall the reaction: 2NaOH + Zn → Na₂ZnO₂ + H₂↑, as given in Activity 2.4 of Chapter 2.
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