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In the electrolysis of a concentrated solution of sodium ...

In the electrolysis of a concentrated solution of sodium chloride using electrodes, which of the following ions are discharged at the cathode and anode respectively?

A.

Na⁺ and Cl^-

B.

Na⁺ and OH^-

C.

H⁺ and OH^-

D.

H⁺ and Cl^-

View answer & explanation

Correct answer is D

In the electrolysis of conc. NaCl,

anions = $Cl^- and OH^-$

cations = $H^+ and Na^+$

So, hydrogen ion will migrate to the cathode, and Cl ion will migrate to the anode at the expense of hydroxide ion because of higher concentration in the solution

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