Question

why only barium hydroxide gives purest hydrogen in the formation of dihydrogen and why it give pure not impure?​

Answer 1

Answer:

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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