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The standard reduction potential of Ag, ...

The standard reduction potential of Ag, Cu, Co and Zn are 0.799, 0.337,-0.277 and 0.762 V respectively. Which of the following cells will have maximum cell emf?

A

`Zn|Zn^(2+) (1M) ||Cu^(2+) (1M) |Cu`

B

`Zn|Zn^(2+)(1M ) ||Ag^(+) (1M ) |Ag`

C

`Cu|Cu^(2+) (1M ) ||Ag^(+) (1 M) |Ag`

D

`Zn|Zn^(2+ ) (1M )||Co^(2+) (1M ) | Co`

Text Solution

Verified by Experts

The correct Answer is:
B
`E^@ = E^@ ""_("cathode") - E^@ ""_("anode")`
` (a) E^@ = 0.337 - ( -0.762 ) = 1.099 V `
`(b) E^@ = 0.799 -( -0.762 ) = 1.561 V `
` (c ) E^@ = 0.799 - 0.337 = 0.462 V `
` (d ) E^@ =- 0.277 -(-0.762 ) = 0.485 V `
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