First slide

Electrochemical cell

Question

The standard reduction potentials of Ag, Cu, Co and Zn are 0.799, 0.337, –0.277 and – 0.762V respectively. Which of the folloing cells will have maximum cell e.m.f.?

Easy

A

Zn / Zn²⁺(1M) // Cu²⁺(1M) / Cu
B

Zn / Zn²⁺(1M) // Ag⁺(1M) / Ag
C

Cu / Cu²⁺(1M) // Ag⁺(1M) / Ag
D

Zn / Zn²⁺(1M) // Co²⁺(1M) / Co

Solution

Metal electrode having higher SRP acts as cathode and lower SRP acts as anode. Higher the difference of SRP more is EMF of cell.

Cell Cathode Anode EMF of cell=E_c - E_a

Zn / Zn²⁺(1M) // Cu²⁺(1M) / Cu Cu Zn 0.337+0.762=1.099V

Zn / Zn²⁺(1M) // Ag⁺(1M) / Ag Ag Zn 0.799+0.762=1.561V

Cu / Cu²⁺(1M) // Ag⁺(1M) / Ag Ag Cu 0.799-0.337=0.462V

Zn / Zn²⁺(1M) // Co²⁺(1M) / Co Co Zn 0.337+0.762=1.099V

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