A) keeping low temperature
B) using large copper electrodes
C) using large zinc electrodes
D) decreasing concentration of \[C{{u}^{2+}}\] ions
Correct Answer: A
Solution :
For Daniell cell, \[Zn+C{{u}^{2+}}\xrightarrow{{}}Z{{n}^{2+}}+Cu\] \[{{E}_{cell}}=E_{cell}^{o}-\frac{RT}{nF}\ln \frac{[Z{{n}^{2+}}]}{[C{{u}^{2+}}]}\] Thus, decreases in temperature and increase in\[[C{{u}^{2+}}]\] will increase the EMF.
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