E^ Cu/Cu^ +2 = +0.34 V, E^ Sn/Sn^ +2 = -0.14 V, E^ Zn/Zn^ 2+ = -0.76 V. Predict spontaneous reaction.

MHT CET Chemistry question

E Cu/Cu = +0.34 V, E Sn/Sn = -0.14 V, E Zn/Zn = -0.76 V. Predict spontaneous reaction.

(A)Zn + CuSO → ZnSO + Cu; Sn + CuCl → SnCl + Cu; Zn + 2HCl → ZnCl + HCorrect
(B)Zn + CuSO → ZnSO + Cu; Cu + SnCl → Sn + CuCl; Zn + 2HCl → ZnCl + H
(C)Zn + CuSO → ZnSO + Cu; Cu + SnCl → CuCl + Sn; Cu + 2HCl → CuCl + H
(D)Zn + CuSO → ZnSO + Cu; Sn + CuCl → SnCl + Cu; Cu + 2HCl → CuCl + H

Answer: (A)

Solution

A metal displaces another (or H) when its reduction potential is lower: Zn (-0.76 V) displaces Cu (+0.34 V) and H (0.00 V), and Sn (-0.14 V) displaces Cu; Cu

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Question ID VK-066378