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a
Zn dissolves at anode and copper deposits at cathode
b
Zn dissolves at cathode and copper deposits at anode
c
Zn deposits at cathode and copper dissolves at anode
d
Zn deposits at anode and copper dissolves at cathode
answer is C.
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Detailed Solution
Increase in external potential starts reaction in opposite direction. Zn acts as cathode and Zn+2 is reduced to Zn and is depositedCu acts as anode and cu dissolves as Cu+2