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Which of the following is laboratory preparation of dihydrogen?
A. `3Fe + 4H_(2)O(steam) rarr Fe_(3) O_(4) + 4H_(2)`
B. `2Na + 2H_(2)O rarr Ca(OH)_(2) + 2H_(2)`
C. `CaH_(2) + 2H_(2)O rarr Ca (OH)_(2) + 2H_(2)`
D. `Zn + H_(2)SO_(4)(dil.) rarr ZnSO_(4) + H_(2)`

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Correct Answer - D
In laboratory, hydrogen gas is prepared by action of dilute `H_(2)SO_(4)` on granulated zinc. `Zn+H_(2)SO_(4)(dil.)to ZnSO_(4)+H_(2)`

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