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Question

Chemistry Question on preparation of dihydrogen

In the industrial production of which of the following, molecular hydrogen is obtained as a byproduct?

A

NaOH

B

NaCl

C

Na metal

D

Na2CO3Na_2CO_3

Answer

NaOH

Explanation

Solution

Molecular hydrogen is produced as a byproduct in the industrial production of NaOH by electrolysis of aq NaClNaCl solution

NaCl→Na++Cl–NaCl → Na^+ + Cl^–

H2O⇌H++OH−H_2O ⇌ H^+ + OH^-

Cathode : 2H2O+2e→H2+2OH–2H_2O + 2e → H_2 + 2OH^–

Anode : 2Cl–→Cl2+2e2Cl^– → Cl_2 +2e

NaOHNaOH is crystallised from the remaining part of electrolyte.