When sodium iodide is heated with concentrate sulphuric acid,the vapour evolved is-

Iodine

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{S O}_{2}

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Sulphuric acid

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Oxygen

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Solution

The correct option is C Iodine
$2 N a I + H_{2} {S O}_{4} h e a t e d - --- \to {N a}_{2} {S O}_{4} + 2 H I$
$2 H I h e a t e d - --- \to H_{2} + I_{2}$

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Which of the following gas is evolved when sodium bisulphite reacts with sulphuric acid?

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