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Which of the following are usually used for the preparation of H₂ gas in laboratory?

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Granulated impure Zn and dilute HCI

Pure Zn and conc. HCI

Pure Zn and conc. $H_{2} {SO}_{4}$

All of the above

answer is A.

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Detailed Solution

Granulated Zn is porous and impure. rt has high surface area, high reactivity and forms Galvanic cell in dilute HCI to produce H₂ gas easily.

$Zn + 2 H^{+} \overset{}{\to} {Zn}^{2 +} + H_{2}$

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