Column-I and Column-II contains four entries each. Entries of Column-I are to be matched with some entries of Column-II. One or more than one entries of Column-I may have the matching with the same entries of Column-II.

Question

	Column-I		Column-II
(A)	Very dilute solution of HCl	(P)	$O_{2}$ evolved at anode
(B)	Very dilute solution of NaCl	(Q)	$H_{2}$ evolved at cathode
(C)	Concentrated solution of NaCl	(R)	${Cl}_{2}$ evolved at anode
(D)	Aqueous ${AgNO}_{3}$	(S)	Ag deposition at cathode

Smart Achievers · Accepted Answer

(4)

Electrolysis of dilute/concentrated NaCl: Water is reduced at the cathode to give hydrogen gas and chloride ion is oxidized at the anode (due to overpotential of oxygen) to give chlorine gas.

Electrolysis of dilute HCl: $H^{+}$ is reduced at the cathode and chloride ion is oxidized at the anode (due to overpotential of oxygen) to give chlorine gas.

Electrolysis of concentrated ${AgNO}_{3}$ : Silver ion is reduced at the cathode to deposit silver and water is oxidized at the anode to give oxygen gas.

Solution

1 A → P, Q; B → R, Q; C → Q, R; D → P, S

2 A → P, Q; B → P, Q; C → Q, R; D → P, Q

3 A → Q, R; B → R, Q; C → Q, R; D → P, S

4 A → P, Q; B → P, Q; C → Q, R; D → P, S

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