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Can we use concentrated H2SO4 in the la...

Can we use concentrated `H_2SO_4` in the laboratory preparation of dihydrogen ? If not, then why?

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No, we cannot use concentrated `H_2SO_4` in the laboratory preparation of dihydrogen. It is because concentrated `H_2SO_4` easily reacts with zinc and produces `SO_2`
`Zn + 2H_2SO_4 to ZnSO_4 + SO_2 + H_2O`
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