Given that the standard potential; (E ) of Cu /Cu and Cu /Cu are 0.34 V and 0.522 V respectively, the E of Cu /Cu is : o 2+ + o +2 + 2+ - ° + – 2+ - + (A) +0.158 V (B) -0.158 V (C) 0.182 V (D) -0.182

Question

Given that the standard potential; (E ) of Cu /Cu and Cu /Cu are 0.34 V and 0.522 V respectively, the E of Cu /Cu is : o 2+ + o +2 + 2+ - ° + – 2+ - +

(A) +0.158 V
(B) -0.158 V
(C) 0.182 V
(D) -0.182 V

Prashant Kotian · Accepted Answer

Correct answer: A) +0.158 V. Cu + 2e ⇾ Cu, E = 0.340 V Cu ⇾ Cu + e , E°= –0.522 V Cu + e ⇾ Cu , E°=? Applying ΔG = –nFE° We get, (-1 x F x E°) = -2 x F x 0.340 + (-1 x F x -0.522) Solving, we get, E°= 0.158 V

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