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Question
Write balanced equation of the reaction in the preparation of : hydrogen from a solution of potassium hydroxide [other than by electrolysis].
Solution
Preparation of H2 from potassium hydroxide
\[\ce{2Al + 2KOH + 2H2O ->\underset{\text{Pot. meta aluminate}}{2KAlO2} + 3H2}\]
OR
\[\ce{Zn + 2KOH ->\underset{\text{[Potassium zincate]}}{K2ZnO2} + H2}\]
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