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The magnitude (but not the sign) of the ...

The magnitude (but not the sign) of the standard reduction potentials of two metals `X` and `Y` are:
`{:(Y^(2+)+2e^(-)rarrY,,|E_(1)^(@)| =0.34V),(X^(2+)+2e^(-)rarrX,,|E_(2)^(@)|=0.25V):}`
When the two half-cells of `X` and `Y` are connected to construct a cell, electrons flow from `X` to `Y`. when `X` is connected to a standard hydrogen electrode `(SHE)`, elecrton flow from `X` to `SHE`. [Use `(2.303RT)/(nF) =0.06]`
If a half-cell `X//X^(2+)(0.1M)` is connected to another half-cell `Y//Y^(2+) (1.0M)` by means of a salt bridge and an external circuit at `25^(@)C` the cell voltage would be:

A

`(0.06V)`

B

`(0.12V)`

C

`(0.62V)`

D

`(0.72V)`

Text Solution

Verified by Experts

The correct Answer is:
C
`X|(X^(+2)),(0.1M)||(Y^(+2)),(1M)|Y`
`E_(cell)= 0.59- (0.059)/(2) log (0.1)/(1)`
`= 0.59+ (0.059)/(2) Rightarrow 0.62V`
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