When the mixture of manganese dioxide and concentrated hydrochloric acid is subjected to heat

hydrogen gas is liberated

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oxygen gas is liberated

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no reaction takes place.

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chlorine gas is liberated.

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Solution

The correct option is D
chlorine gas is liberated.

When the mixture of manganese dioxide and concentrated hydrochloric acid is subjected to heat, chlorine gas is liberated with formation mangenese chloride and water.

$M n O_{2} + 4 H C l (c o n c .) + h e a t \to M n C l_{2} + 2 H_{2} O + C l_{2}$

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