Hydrogen is prepared from \( \mathrm{H}_{2} \mathrm{O} \) by adding...

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Hydrogen is prepared from \( \mathrm{H}_{2} \mathrm{O} \) by adding:
(DUMET 2011)
(a) \( \mathrm{Ca} \), which acts as reducing agent
(b) Al, which acts as oxidising agent
\( \mathrm{P} \)
(c) Ag, which acts as reducing agent
(d) Au, which acts as oxidising agent
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