The correct option is A barium #160;Pure hydrogen gas can be #10;prepared by the electrolysis of warm solution of barium hydroxide using #10;platinum or ...

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Preparation of Hydrogen

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Question

High purity (>99.95%) dihydrogen is obtained by electrolyzing warm aqueous ________ hydroxide solution between nickel electrodes.

magnesium

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barium

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calcium

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sodium

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Solution

The correct option is A barium
Pure hydrogen gas can be prepared by the electrolysis of warm solution of barium hydroxide using platinum or nickel electrodes. As water does not conduct electricity very well, so it is usual to electrolyse aqueous solution of barium hydroxide. The gases produced in the anode and cathode compartment must be kept separate. Following reactions occur at anode and cathode.

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