High purity (> 99.95%) dihydrogen is obtained by:

Electrolysis of acidified water using platinum electrodes

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Electrolyzing warm aq.

B a (O H)_{2}

using nickel anode and iron cathode

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Electrolysis of brine solution

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Reaction of steam on hydrocarbons or coke at high temperature in the presence of catalyst

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Solution

The correct option is B Electrolyzing warm aq. $B a (O H)_{2}$ using nickel anode and iron cathode
Very pure hydrogen is made by the electrolysis of water or solutions of a base
like $B a (O H)_{2}$ using nickel anode and iron cathode. This is very expensive and
thus finds use only if pure $H_{2}$ is needed.

Pure water does not conduct electricity well and thus the need for the base.
The gases collected should be separated by a diaphragm so they don't
react explosively to yield water again.

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