Which of the following gas is evolved when concentrated hydrochloric acid is made to react with manganese dioxide?

O_{3}

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O_{2}

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H_{2}

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{C l}_{2}

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Solution

The correct option is D ${C l}_{2}$
When concentrated hydrochloric acid reacts with manganese dioxide, chlorine gas as well as manganese(II) chloride and water.

${M n O}_{2} + 4 H C l \to {M n C l}_{2} + {C l}_{2} + 2 H_{2} O$

Hence, option $D$ is correct.

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