First slide

Standard EMF of a cell

Question

Select the correct statement(s) for the given reaction.
$Cu (s) + 2 {Ag}^{+} (aq) \to {Cu}^{2 +} (aq) + 2 Ag (s)$

Easy

A

Reaction at cathode $Cu (s) \to {Cu}^{2 +} (aq) + 2 e^{-}$
B

$E_{cell} = E_{{Cu}^{2 +} / Cu}^{o} = E_{{Ag}^{+} / Ag}^{o}$
C

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

None of the above

Solution

The cell representation of the given reaction is $Cu (s) |{Cu}^{2 +} (aq)| |{Ag}^{+} (aq)| Ag (s)$
$E_{cell}^{o} = E_{{Ag}^{+} / Ag}^{o} - E_{{Cu}^{2 +} / Cu}^{o}$
Anode reaction is $Cu (s) \to {Cu}^{2 +} (aq) + 2^{e -}$ and cathode reaction is $2 {Ag}^{+} (aq) + 2 e^{-} \to 2 Ag (s) .$

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