State, giving reasons, whether the substances printed in bold letters have been oxidised or reduced.
$M g + 2 H C l \to M g C l_{2} + H_{2}$

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Solution

Oxidation: The process in which an atom loses electrons.
When magnesium reacts with hydrochloric acid (HCl), it loses two electrons $M g {^{2}}^{+}$ which results in the formation of magnesium chloride $(M g C l_{2})$ .
So, Mg is getting oxidised in this reaction.

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What information does the following chemical equations convey ?

(a) $Z n$ + $H_{2} S O_{4}$ $\to$ $Z n S O_{4}$ + $H_{2}$

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