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A galvanic cell is composed of two hydr...

A galvanic cell is composed of two hydrogen electrods, one of which is a standard one. In which of the following solutions should the other electrode be immersed to get maximum e.m.f:

A

0.1 M HCl

B

0.1 M `CH_(3)COOH`

C

`0.1M` `H_(2)PO_(4)`

D

`0.1 M H_(2)SO_(4)`

Text Solution

Verified by Experts

The correct Answer is:
B
`E_(cell)=0.059log((C_(1))/(C_(2)))` ltbr. For `E_(cell)` to be `+ve` and maximum
`(C_(1))/(C_(2))lt1` or `C_(1)ltC_(2)` give `C_(2)=1M`.
`thereforeC_(1)` should be the minimum conc. Of `H^(+)` `therefore` (b) is the right answer
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