Give various methods for commercial production of dihydrogen.

Explanation

The commonly used methods for production of dihydrogen are as follows:
i) By electrolysis of acidified water by using platinum electrodes.
`2H_2O (l) underset("Traces of acid/base")overset("Electrolysis ")(to) 2H_2(g) + O_2 (g)`
ii) By reaction of steam on hydrocarbons at high temperatures in the presence of a catalyst.
`CH_4(g) + H_2O (g) underset(Ni)overset(1270K)(to) underset("water gas")(CO(g) + 3H_2(g))`