Oxidation of which of the following reagent with manganese dioxide $(M n O_{2})$ gives chlorine?

Conc.

H C l

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Dil.

H C l

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H_{2} S O_{4}

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H N O_{3}

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Solution

The correct option is A Conc. $H C l$
Oxidation of $H C l$ (conc.) with manganese dioxide( $M n O_{2}$ ) gives chlorine. The reaction involved can be written as:
$M n O_{2} + 4 H C l \to M n C l_{2} + 2 H_{2} O + C l_{2}$

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H C l

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