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Two half cell reactions are given as : ...

Two half cell reactions are given as :
(i) `Fe_(aq)^(2+)+2e^(-) to Fe_((s)),E^(@)=-0.44" V "`
(ii) `2H_((aq))^(+)+(1)/(2)O_(2)(g)+2e^(-) to H_(2)O(l),E^(@)=+1.23" V "`
The `E^(@)` for the reaction
`Fe_(s)+2H^(+)+(1)/(2)O_(2)(g) to Fe_(aq)^(2+)+H_(2)O_(l)` is

A

`+1.67" V "`

B

`-1.67" V "`

C

`+0.79" V "`

D

`-0.79" V "`

Text Solution

Verified by Experts

The correct Answer is:
A
(a) Subtract equation (i) from equation (ii) to get equation (iii) `E^(@)=(+1.23)-(-0.44)=+1.67" V "`.
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