Give reason for the following : (a) `Conc. H_2 SO_4` cannot be used fo – InterviewSolution

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1.	Give reason for the following : (a) `Conc. H_2 SO_4` cannot be used for drying `H_2`. (b) `KMnO_4` should not be dissolved in `conc. H_2 SO_4`.
Answer» (a) Hydrogen sometimes ignites with the large amount of heat released when water is absorbed by `conc. H_2 SO_4`. (b) `Mn_2 O_7` is formed when `KMnO_4` is dissolved in `conc. H_2 SO_4. Mn_2 O_7` formed is highly unstable and explosive in nature. `2 KMnO_4 + 2 H_2 SO_4 rarr K_2 SO_4 + (MnO_3)_2 SO_4 + 2H_2 O` `(MnO_3)_2 SO_4 + H_2 O rarr Mn_2 O_7 + H_2 SO_4`.

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