When magnesium reacts with dilute hydrochloric acid, bubbles are formed due to the liberation of gas.

oxygen

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chlorine

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hydrogen

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Solution

The correct option is C hydrogen
When magnesium reacts with dilute hydrochloric acid, magnesium chloride and hydrogen gas are produced.
The bubbles observed during the reaction are due to hydrogen.

The reaction that takes place is represented as:
Magnesium + Hydrochloric acid $\to$ Magnesium chloride + Hydrogen gas

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