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Q.

Consider the following four electrodes: A = Cu2+(0.0001 M)/Cu(s); B = Cu2+(0.1 M)/Cu(s) ; C = Cu2+(0.01 M)/Cu(s); D = Cu2+(0.001 M)/Cu(s). If the standard reduction potential of Cu+2 /Cu is +0.34V, the reduction potentials (in volts) of the above electrodes follow the order

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a

A>D>C>B

b

B>C>D>A

c

C>D>B>A

d

A>B>C>D

answer is B.

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Detailed Solution

Cu+2+2e-Cu

ERP=ERP0+0.05912log[Cu+2]

ERP[M+n]cathode

 R.P. =A<D<C<B

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