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Question

Identify the gas evolved in the following reactions when: Concentrated hydrochloric acid is made to react with manganese dioxide.

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Solution

In this reaction manganese dioxide acts as an oxidising agent. It oxidises conc. HCl and liberates chlorine gas. Manganese dioxide is a powerful oxidising agent.
MnO2+4HClMnCl2+2H2O+Cl2

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