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Q82 (NDA-II/2013) Science & Technology › Basic Science (Physics, Chemistry, Biology) › Basic chemical principles Answer Verified

A gas is evolved when a piece of zinc metal is placed in dilute sulphuric acid (H2S04). What is the gas?

Result
Your answer: —  Â·  Correct: A
Explanation

When a piece of zinc metal is placed in dilute sulphuric acid (H2SO4), a single displacement reaction occurs where zinc displaces hydrogen from the acid [2]. Zinc, being more reactive than hydrogen, undergoes oxidation to form zinc sulphate (ZnSO4), while the hydrogen ions from the acid are reduced to form hydrogen gas (H2). This reaction is summarized by the general chemical principle: Acid + Metal → Salt + Hydrogen gas [2]. The evolution of this gas is characterized by the formation of bubbles and can be confirmed by a 'pop' sound test when a burning matchstick is brought near it. This specific reaction is a standard laboratory method for producing hydrogen gas. The chemical equation for the process is Zn + H2SO4 → ZnSO4 + H2.

Sources

  1. [1] Science , class X (NCERT 2025 ed.) > Chapter 1: Chemical Reactions and Equations > Figure 1.2 > p. 2
  2. [2] Science , class X (NCERT 2025 ed.) > Chapter 2: Acids, Bases and Salts > Activity 2.3 > p. 20
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