A) \[[Z{{n}^{2+}}]\] should be increased
B) \[[Z{{n}^{2+}}]\] should be decreased
C) \[[C{{l}^{-}}]\] should be decreased
D) \[{{P}_{C{{l}_{2}}}}\] should be decreased
Correct Answer: A
Solution :
According to Nernsts equation. \[{{E}_{cell}}={{E}^{o}}_{cell}-\frac{nRT}{F}\log \frac{{{C}_{1}}}{{{C}_{2}}}\] where, \[{{C}_{1}}=\] concentration of anode \[=[Z{{n}^{2+}}]\] \[{{C}_{2}}=\] concentration of cathode \[=[C{{l}^{-}}]\] \[\therefore \] EMF of cell to be maximum \[{{C}_{1}}\]or \[[Z{{n}^{2+}}]\] should be increased.
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