Dihydrogen of high purity $(>99.95 \%)$ is obtained through:
- Athe electrolysis of warm $Ba(OH)_2$ solution using $Ni$ electrodes.
- Bthe reaction of $Zn$ with dilute $HCl$.
- Cthe electrolysis of brine solution.
- Dthe electrolysis of acidified water using $Pt$ electrodes.
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