1. The gas liberated, when magnesium reacts with hydrochloric acid is ____.
a) Hydrogen
b) Oxygen
c) Carbon dioxide
d) Nitrogen
Answer : Hydrogen
The correct answer is a) Hydrogen.
Explanation:
When magnesium (Mg) reacts with hydrochloric acid (HCl), a chemical reaction takes place that produces hydrogen gas and magnesium chloride (MgCl₂). The reaction can be represented by the following chemical equation:
Mg (solid) + 2HCl (aqueous) → MgCl₂ (aqueous) + H₂ (gas)
In this reaction, magnesium displaces the hydrogen ions from hydrochloric acid, and as a result, hydrogen gas (H₂) is liberated. The gas produced is hydrogen, not oxygen, carbon dioxide, or nitrogen.
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