Manganese dioxide (MnO₂) reacts with hydrochloric acid (HCl) to produce magnesium chloride (MgCl₂), water (H₂O), and chlorine (Cl₂) gas. The chemical equation involved in the reaction is given as:
MnO₂ (s) + 4HCl (aq) → MnCl₂ (s) + 2H₂O (l) + Cl₂ (g)
Which of the following substances is oxidised in the given reaction?

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HCl

H₂O

MnO₂

MnCl₂

answer is A.

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Detailed Solution

The given reaction is an example of an oxidation-reduction reaction or redox reaction.

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If a substance gains oxygen or loses hydrogen during a reaction, it is oxidised. If a substance loses oxygen or gains hydrogen during a reaction, it is reduced. In the given reaction, HCl loses hydrogen to form Cl₂. Hence, HCl is oxidised in the given reaction.

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