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  4. Which salt on heating with conc. H2SO4 gives violet vapours?

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Q. Which salt on heating with conc. $H_{2}SO_{4}$ gives violet vapours?

NTA AbhyasNTA Abhyas 2020

Solution:

$KI+\underset{C o n c .}{H_{2} S O_{4}}\overset{\Delta }{ \rightarrow }KHSO_{4}+HI$

$ \, \text{conc} \text{.} \, \text{H}_{\text{2}} \text{SO}_{\text{4}} \text{+ 2HI} \rightarrow \underset{\text{Violet} \, \text{vapours}}{\text{2H}_{\text{2}} \text{O + I}_{\text{2}} \text{+ SO}_{\text{2}}}$