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Question

For the following cell:
Zn(s)|ZnSO4(aq)||CuSO4(aq))|Cu(s)
When the concentration of Zn2+ is 10 times the concentration of Cu2+, the expression for ΔG (inJmol1) is
[F is Faraday constant; R Is gas constant; T is temperature ; E(cell)=1.1v]

A
2.303 RT + 1.1 F
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B
1.1 F
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C
2.303 RT - 2.2 F
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D
-2.2 F
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Solution

The correct option is C 2.303 RT - 2.2 F
ΔG=ΔG+2.303RTlog10Q;Q=[Zn2+]Cu2+
=2F(1.1)+2.303 RT log10 10
=2.303 RT2.2F

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