Which of the following processes can be used for preparation of \( \mathrm{H}_{2} \) gas? (a) Di...

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Which of the following processes can be used for preparation of \( \mathrm{H}_{2} \) gas?
(a) Dissolving \( \mathrm{LiH} \) in water.
(b) Reaction of \( \mathrm{Al} \) with \( \mathrm{NaOH} \) solution.
(c) Reaction of \( \mathrm{Zn} \) with dilute \( \mathrm{H}_{2} \mathrm{SO}_{4} \).
(d) Electrolysis of \( \mathrm{H}_{2} \mathrm{O} \) in the presence of \( \mathrm{KOH} \).
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