JEE Main · 2020 · 06 Sep 2020 · Shift 2 · Hydrogen

Dihydrogen of high purity (>99.95%) is obtained through:

(A)the reaction of Zn with dilute HCl.
(B)the electrolysis of acidified water using Pt electrodes
(C)the electrolysis of brine solution.
(D)the electrolysis of warm $Ba (OH)_{2}$ solution using Ni electrodes.✓ Correct

Answer: (D)

Solution

Dihydrogen of very high purity, better than

99.95%

, comes from the electrolysis of warm barium hydroxide solution using nickel electrodes. The acid routes, such as zinc with dilute

HCl

or electrolysis of acidified water, leave the gas less pure, so it is the warm

Ba (OH) X_{2}

electrolysis over nickel that yields the high-purity hydrogen.

JEE Main · 2020 · 06 Sep 2020 · Shift 2 · Single correct option