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Questions  

The standard equilibrium constant of the reaction

2Cu+(aq)Cu2+(aq)+Cu(s)

is about [Given: ECu+Cu=0.53V and ECu2+Cu=0.34V

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By Expert Faculty of Sri Chaitanya
a
2.76×105
b
2.76×106
c
2.76×107
d
2.76×108
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detailed solution

Correct option is B

Consider the cell

Cu(s)Cu2+(1M)Cu+(1M)Cu

The cell reaction is

 RHC     Cu++eCuLHC    CuCu2++2eCell reaction     2Cu+Cu+Cu2+ Cell potential     Ecell=ECu+CuECu2+Cu

Thus  Ecell=ECu+CuECu2Cu=0.53V0.34V=0.19V

 Finally nFEcell=RTlnKeq  or  logKeq=nEcell2.303(RT/F)

or logKeq=(2)(0.19V)(0.059V)=6.44

Keq =106.44=2.76×106


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