Identify the gas evolved when :
(ii) Concentrated hydrochloric acid is made to react with manganese dioxide

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Solution

When concentrated hydrochloric acid is made to react with manganese dioxide, chlorine gas is evolved along with manganese(II) chloride and water.
The reaction involved is:
$M n O_{2} + 4 H C l \to M n C l_{2} + 2 H_{2} O + C l_{2} ↑$

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