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Question

Assertion :In the Daniell cell, if concentrations of Cu2+ and Zn2+ ions are doubled, the emf of the cell will be doubled. Reason: If the concentration of ions in contact with the metals is doubled, the electrode potential is doubled.

A
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
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B
Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
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C
Assertion is correct but Reason is incorrect
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D
Assertion is incorrect but Reason is correct
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Solution

The correct option is D Assertion is incorrect but Reason is correct
In Daniell cell, the cell emf is directly proportional to the ratio of the concentration of the Cu2+ and Zn2+;
so, on increasing the concentration of both ions, the ratio will remain constant and hence the emf will also be constant;
but electrode potential is directly proportional to the concentration of metal ion;
so, assertion is incorrect but the reason is correct.

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