AI-generated practice question — model-generated for extra practice, not a previous-year CBSE board question.
(c) Hydrogen
When zinc reacts with dilute sulphuric acid, hydrogen gas is evolved:
$\text{Zn} + \text{H}_2\text{SO}_4 \rightarrow \text{ZnSO}_4 + \text{H}_2\uparrow$
Source: Chapter 1, Section 1.1.2 Balanced Chemical Equations
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The textbook explicitly gives this reaction as an example while explaining balanced chemical equations. Zinc displaces hydrogen from dilute sulphuric acid, producing zinc sulphate and hydrogen gas. This is a displacement reaction. Remember: active metals (like Zn, Fe, Mg) react with dilute acids to release H₂ gas — never O₂, CO₂, or SO₂.