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Standard XII

Chemistry

Oxidation Number Method

A test tube c...

Question

A test tube containing a nitrate and another containing a bromide and $M n O_{2}$ are treated with conc. $H_{2} S O_{4}$ . The brown fumes evolved are passed in water. The water will be coloured by the :

nitrate

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bromide

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both (A) and (B)

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none of the above

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Solution

The correct option is D bromide
A test tube containing a nitrate and another containing a bromide and $M n O_{2}$ are treated with conc. $H_{2} S O_{4}$ . The brown fumes evolved are passed in water. The water will be coloured by the bromide.
$2 K B r + H_{2} S O_{4} \to K_{2} S O_{4} + 2 H B r ↑$
$2 H B r + H_{2} S O_{4} \to 2 H_{2} O + S O_{2} ↑ B r_{2} ↑ (r e d d i s h b r o w n)$

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