The standard reduction potential of Cu2+/Cu and Cu2+/Cu+ are 0.337 and 0.153V respectively. The standard electrode potential of Cu+/Cu half cell is:
A
0.184V
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B
0.827V
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C
0.521V
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D
0.490V
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Solution
The correct option is C0.521V Cu2++2e−→Cu;△G1→(1)Cu2++e−→Cu+;△G2→(2) Subtracting (2) from (1) we get Cu++e−→Cu;△G3Now,ΔG3=−nFE3⇒ΔG3=ΔG1−ΔG2 ⇒−FE3=−2FE1−(−FE2)⇒E3=2E1−E2⇒E3=2×0.337−0.153=0.521V