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Concentrated sulphuric acid cannot be us...

Concentrated sulphuric acid cannot be used for drying `H_2`. Why?

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Conc. `H_(2)SO_(4)` on absorbing `H_(2)O` from moist `H_(2)` produces so much heat that hydrogen catches fire.
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a. Which isotpe of hydrogen is used as a tracer in organic reactions.? b.Concentrated H_(2)SO_(4) cannot be used for drying H_(2) . Why? c. The electrolysis of water of manufactures H_(2) gas is always carried out in presence of acid (H_(2)SO_(4)) or alkali (KOH) , yet no SO_(4)^(2-) or K^(o+) are discharged. Why?