Violet vapors are given out when _________ is treated with $c o n c . H_{2} S O_{4}$ .

bromide

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iodide

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chloride

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nitrate

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Solution

The correct option is B iodide
Violet vapours are given out when iodide is treated with conc. $H_{2} S O_{4}$ .
$N a I + H_{2} S O_{4} \to H I + N a H S O_{4}$
$H_{2} S O_{4} + 2 H I \to I_{2}$ (violet vapours) $+ S O_{2} + 2 H_{2} O$

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