1.

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?

Answer»

`Zn|Zn^(2+) (1M) ||CU^(2+) (1M)|Cu`
`Zn|Zn^(2+)(1M )||Ag^(+)(1M )|Ag`
`Cu|Cu^(2+) (1M )||Ag^(+)(1 M)|Ag`
`Zn|Zn^(2+ )(1M)||Co^(2+) (1M ) | Co`

Solution :`E^@= E^@""_("cathode") - E^@ ""_("ANODE")`
` (a)E^@= 0.337- ( -0.762)=1.099V `
`(b)E^@= 0.799-( -0.762) = 1.561V `
` (c )E^@= 0.799- 0.337= 0.462V `
` (d )E^@=- 0.277-(-0.762) = 0.485 V `


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