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Question

In the Daniel cell, which of the following changes increases the cell EMF?

A
Increasing the concentration of ZnSO4
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B
Increasing the dilution of ZnSO4
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C
Decreasing the concentration of CuSO4
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D
Increasing the dilution of CuSO4
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Solution

The correct option is B Increasing the dilution of ZnSO4
Zn+Cu2+Zn2++Cu
Ecell=EcellRTnFlog(Zn2+Cu2+)
As for Ecell to increase, log(Zn2+Cu2+) should decrease.


[Zn2+][Cu2+] should decrease.


Either concentration of CuSO4 should increase or concentration of ZnSO4 should decrease.

As the concentration of ZnSO4 decreases, its dilution increases.

Hence, option B is correct.


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