Zn is placed above hydrogen in electroch...

Zn is placed above hydrogen in electrochemical series. lt can replace hydrogen from acids. But, conc `H_2SO_4`, conc. HCI or Nitric acid are not preferred in the laboratory preparation of hydrogen from granular zinc. Why ?

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Zn is placed above hydrogen in electrochemical series. lt can replace hydrogen from acids. But, conc `H_2SO_4`, conc. HCI or Nitric acid are not preferred in the laboratory preparation of hydrogen from granular zinc. Why ?

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