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Representation of Cell

Which one of ...

Question

Which one of the following conditions will increase the voltage of the cell represented by the equation?
$C u (s) + 2 A g^{+} (a q .) ⇌ C u^{2 +} (a q .) + 2 A g (s)$ .

A

Increase in the dimension of

C u

electrode

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B

Increase in the dimension of

A g

electrode

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C

Increase in the concentration of

C u^{2 +}

ion

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D

Increase in the concentration of

A g^{+}

ion

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Solution

The correct option is D Increase in the concentration of $A g^{+}$ ion
Cell voltage will increase, either by increasing the concentration of $C u^{2 +}$ ion or by decreasing the concentration of $A g^{+}$ .
$Q = \frac{[C u^{2 +}]}{[A g^{+}]}$
Lesser is the value of $Q$ , greater is the cell voltage.

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