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The EMF of concentration cell consisting...

The `EMF` of concentration cell consisting of two zinc electrodes, one dipping into `M//4` solution of `ZnSO_(4)` and the other into `M//16` solution of the same salt at `25^(@)C` is

A

`0.0125V`

B

`0.0250V`

C

`0.0178V`

D

`0.0356V`

Text Solution

Verified by Experts

The correct Answer is:
c
For concentration cell, `E^(c-)=0`
`Zn|underset(Low conc)(Zn^(2+)(M//16))||underset(High conc)(Zn^(+2)(M//4))|Zn`
`E=-(0.059)/(2)log.((Zn^(2+))_(a))/((Zn^(2+))_(c))`
`=-(0.059)/(2) log .(M//16)/(M//4)`
`=-(0.059)/(2)log.((1)/(4))`
Solve,` E=0.0178 V`
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