On addition of conc. $H_{2} S O_{4}$ to a chloride salt, colourless fumes are evolved but in case of an iodide salt, violet fumes come out. This is because:

H_{2} S O_{4}

reduces HI to

I_{2}

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H I

is of violet colour

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H I

gets oxidised to

I_{2}

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H I

changes to

H I O_{3}

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Solution

The correct option is C $H I$ gets oxidised to $I_{2}$

Hydrogen iodide ( $H I$ ) formed during reaction is oxidized to $I_{2}$ which is violet in colour. This will not happened during the formation of halogen acid, $H C l$ .

$N a C l + H_{2} S O_{4} \to N a_{2} S O_{4} + 2 H C l$

$N a I + H_{2} S O_{4} \to N a_{2} S O_{4} + 2 H I \to 2 H_{2} O + S O_{2} + I_{2}$ .
Hence option C is correct.

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