Question

Very pure hydrogen can be made by which of the following processes?

A

Reaction of methane with steam

B

Mixing natural hydrocarbons of high molecular weight

C

Electrolysis of water

D

Reaction of salt like hydrides with water

Hard
JEE Mains

Solution

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Correct option is
C

Electrolysis of water

Pure hydrogen can be obtained from the electrolysis of water.

Cathode (reduction): Β 

Anode (oxidation): Β  Β 

Combining either half reaction pair yields the same overall decomposition of water into oxygen and hydrogen:

Overall reaction:

The number of hydrogen molecules produced is thus twice the number of oxygen molecules.

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