Which gas is evolved when a metal reacts with a dilute acid?
Answer and explanation
Correct answer: B. Hydrogen
- Step 1: Reactive metals displace hydrogen from dilute mineral acids (such as dilute hydrochloric acid or sulphuric acid) according to the general chemical reaction: $ ext{Metal} + ext{Dilute Acid} o ext{Metal Salt} + ext{Hydrogen Gas}$.
- Step 2: For example, when zinc granules react with dilute sulphuric acid (), hydrogen gas is liberated and can be confirmed by a characteristic pop sound when ignited with a burning splinter.
Answer
Hydrogen.
Why not the others: Carbon dioxide evolves from metal carbonates; Nitrogen and Oxygen are atmospheric gases not displaced by active metals.
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