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  4. A salt, which on heating with conc. H2SO4 gives violet vapour is

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Q. A salt, which on heating with conc. $H_2SO_4$ gives violet vapour is

The p-Block Elements - Part2

Solution:

$KI + \underset{Conc.}{H_2SO_4} \xrightarrow{\mathring{A} } KHSO_4 + HI$
Conc. $H_2SO_4 + 2HI \to 2H_2O + \underset{\overset{\text{Violet}}{\text{vapour}}}{I_2} + SO_2\uparrow $