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On addition of conc. H2SO4 to a chloride...

On addition of conc. `H_2SO_4` to a chloride salt, colourless fumes are evolved but in case of iodide salt, violet fumes come out. This is because

A

`H_2SO_4` reduces HI to `I_2`

B

HI is of violet colour

C

HI gets oxidised to `I_2`

D

HI changes to `HIO_3`

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