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For the galvanic cell ${Zn}_{(s)} + {Cu}_{(aq)}^{+ 2} \to {Zn}_{(aq)}^{+ 2} + {Cu}_{(s)}$ , the emf of the cell can be increased by

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Increasing [Zn⁺²]

Decreasing [Zn⁺²]

Increasing mass of Zn electrode

Decreasing [Cu⁺²]

answer is B.

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Detailed Solution

$E = E^{0} - \frac{0.0591}{2} \log \frac{[{Zn}^{+ 2}]}{[{Cu}^{+ 2}]}$

Increasing mass of Zn electrode increases life span of the cell

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