The emf of cell is 0.83 V at 298 K. It could be increased by:

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Q.
The emf of cell $T l | \underset{(0.001 M)}{T l^{+}} | | \underset{(0.01 M)}{C u^{2 +}} | C u$ is 0.83 V at 298 K. It could be increased by: [2024]

1 Decreasing concentration of both ${Tl}^{+}$ and ${Cu}^{2 +}$ ions

2 Increasing concentration of ${Cu}^{2 +}$ ions

3 Increasing concentration of both ${Tl}^{+}$ and ${Cu}^{2 +}$ ions

4 Increasing concentration of ${Tl}^{+}$ ions

Ans.
(2)

Anode half cell reaction: $T l \to T l^{+} + e^{-}$

Cathode half cell reaction: ${Cu}^{2 +} + 2 e^{-} \to Cu$

Net cell reaction: $2Tl + {Cu}^{2 +} \to 2 {Tl}^{+} + Cu$

When above reaction shifts forward, emf of the cell increases.
By Le-Chatelier’s principle, above reaction shifts forward by increasing the conc. of ${Cu}^{2 +}$ .

Solution

Q.
The emf of cell $T l | \underset{(0.001 M)}{T l^{+}} | | \underset{(0.01 M)}{C u^{2 +}} | C u$ is 0.83 V at 298 K. It could be increased by: [2024]

1 Decreasing concentration of both ${Tl}^{+}$ and ${Cu}^{2 +}$ ions

2 Increasing concentration of ${Cu}^{2 +}$ ions

3 Increasing concentration of both ${Tl}^{+}$ and ${Cu}^{2 +}$ ions

4 Increasing concentration of ${Tl}^{+}$ ions

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Solution

Q. The emf of cell Tl|Tl+(0.001 M)||Cu2+(0.01 M)|Cu is 0.83 V at 298 K. It could be increased by: [2024]

1 Decreasing concentration of both Tl+and Cu2+ ions

2 Increasing concentration of Cu2+ ions

3 Increasing concentration of both Tl+ and Cu2+ ions

4 Increasing concentration of Tl+ ions

Ans. (2) Anode half cell reaction: Tl→Tl++e- Cathode half cell reaction: Cu2++2e-→Cu Net cell reaction: 2Tl+Cu2+→2Tl++Cu When above reaction shifts forward, emf of the cell increases. By Le-Chatelier’s principle, above reaction shifts forward by increasing the conc. of Cu2+.

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Q.
The emf of cell $T l | \underset{(0.001 M)}{T l^{+}} | | \underset{(0.01 M)}{C u^{2 +}} | C u$ is 0.83 V at 298 K. It could be increased by: [2024]

1 Decreasing concentration of both ${Tl}^{+}$ and ${Cu}^{2 +}$ ions

2 Increasing concentration of ${Cu}^{2 +}$ ions

3 Increasing concentration of both ${Tl}^{+}$ and ${Cu}^{2 +}$ ions

4 Increasing concentration of ${Tl}^{+}$ ions