First slide

Standard EMF of a cell

Question

Select the correct cell reaction of the cell $Ag (s) | | {Ag}^{+} (aq) ∥ {Cu}^{2 +} (aq) ∣ Cu (s) :$

Easy

A

$2 Ag (s) + Cu (s) ⟶ {Cu}^{+ 2} (aq) + 2 {Ag}^{+} (aq)$
B

$Cu (s) + 2 {Ag}^{+} (aq) ⟶ {Cu}^{2 +} (aq) + 2 Ag (s)$
C

$2 Ag (s) + {Cu}^{2 +} (aq) ⟶ Cu (s) + 2 {Ag}^{+} (aq)$
D

${Cu}^{2 +} (aq) + 2 {Ag}^{+} (aq) ⟶ 2 Ag (s) + Cu (s)$

Solution

$2 Ag (s) ⇄ 2 {Ag}^{+} (aq) + 2 e^{-} \underset{___________________________________Netreaction : 2 Ag (s) + {Cu}^{2 +} (aq) ⇌ 2 {Ag}^{+} (aq) + Cu (s)}{Cathode : {Cu}^{2 +} (aq) + 2 e^{-} ⇌ Cu (s)}$

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