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Why conc. H2 SO4 cannot be used to dry ...

Why `conc. H_2 SO_4` cannot be used to dry hydrogen sulphide ?

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Concentrated `H_(2) SO_(4)` is an oxidising agent, while hydrogen sulphide is reducing agent and both react to form free sulphur. Hence `conc. H_(2) SO_(4)` cannot be used to dry `H_(2) S`.
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