Which of the following is the laboratory preparation of dihydrogen?

3 F e + 4 H_{2} O (s t e a m) \to F e_{3} O_{4} + 4 H_{2}

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2 N a + 2 H_{2} O \to 2 N a O H + H_{2}

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C a H_{2} + 2 H_{2} O \to C a {(O H)}_{2} + 2 H_{2}

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Z n + H C l (d i l .) \to Z n C l_{2} + H_{2}

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Solution

The correct option is D $Z n + H C l (d i l .) \to Z n C l_{2} + H_{2}$
In the laboratory, hydrogen gas is prepared by the action of dilute $H_{2} S O_{4}$ on granulated zinc.

$Z n + 2 H C l (d i l .) \to Z n C l_{2} + H_{2}$

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