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The standard emf of the cell, Cd(s) |CdC...

The standard emf of the cell, `Cd(s) |CdCI_(2) (aq) (0.1M)||AgCI(s)|Ag(s)` in which the cell reaction is `Cd(s) +2AgCI(s) rarr 2Ag(s) +Cd^(2+) (aq)` is `0.6915 V` at `0^(@)C` and `0.6753V` at `25^(@)C`. The `DeltaH` of the reaction at `25^(@)C` is,-

A

(-176)

B

(-234.7)

C

`(123.5)`

D

`(-167.6)`

Text Solution

Verified by Experts

The correct Answer is:
D
`Cd(s) CdCl_(2)(0.1M)|AgCl//Ag (s)` is equivalent to , `Cd(s)Cd^(2+)(0.1M)||Cl^(-) (0.2M) //Ag Cl(s) //Ag(s)`
use: `DeltaH = nF[t(dE_(cell))/(dT)-E_(cell)]`
`DeltaH_(25^(@))C = 2xx96500[298xx((0.6753-0.6915)/(25-0))-0.6753] =- 167.6KJmol^(-1)`
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