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The standard reduction potential of Pb a...

The standard reduction potential of Pb and Zn electrodes are -0.12 6 and -0.763 volts respectively . The e.m.f of the cell
`Zn|Zn^(2+)(0.1M)||Pb^(2+)(1M)Pb` is

A

0.637 V

B

lt0.637V

C

gt0.637V

D

0.889V

Text Solution

Verified by Experts

The correct Answer is:
D
`E_("cell")^@ = E_("cell")^@ - (0.059)/(n) "" log (K)`
For chemical reaction, n = 2
`Zn + Pb^(2+) to Zn^(2+) + Pb`
`E_("cell")^@ = E_("cathode") - E_("anode")`
`= 0.126 - (-0.763)`
= 0.889 V
`E_("cell") = 0.889 - (0.059)/(2) log (0.1)`
=0.889 V
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