Conc. $H_{2} S O_{4}$ cannot be used for drying up $H_{2} S$ . Explain.

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Solution

$H_{2} S$ is oxidised in presence of $H_{2} {S O}_{4}$ . Hydrogen sulphide gas cannot be dried using sulphuric acid as $H_{2} S$ gas is oxidised by sulphuric acid to Sulphur. Therefore, the $H_{2} S$ gas has chemical action with acid and hence it reacts with it, therefore, cannot be dried using it.
$H_{2} S + H_{2} {S O}_{4} ⟶ 2 H_{2} O + {S O}_{2} + S$

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Explain clearly how conc. $H_{2} S O_{4}$ is used as dehydrating as well as drying agent.

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