1.

E_(1),E_(2) and E_(3) the emf values of the three galvanic cells respectively. (i) Zn|Zn_(0.1M)^(2+)||Cu_(0.1M)^(2+)|Cu, (ii) Zn|Zn_(0.1M)^(2+)||Cu_(0.1M)^(2+)|Cu ltBrgt (iii) Zn|Zn_(0.1M)^(2+)||Cu_(0.1M)^(2+)|Cu Which one of the following is true

Answer»

`E_(2) gt E_(3) gt E_(1)`
`E_(3) gt E_(2) gt E_(1)`
`E_(1) gt E_(2) gt E_(3)`
`E_(1) gt E_(3) gt E_(2)`

SOLUTION :E.m.f. of the CELL`=E_(cell)^(o)-(0.0591)/(n)log_(10)[(ZN^(2+))/(Cu^(2+))]`
Higher the `([Zn^(2+)])/([Cu^(2+)])` ratio lower is the e.m.f. of cell.
(i) `"log"[(Zn^(2+)])/([Cu^(2+)])=10,""(ii)" log"([Zn^(2+)])/([Cu^(2+)])=1`
(III) `"log"([Zn^(2+)])/([Cu^(2+)])=0.1`
So is `E_(3) gt E_(2) gt E_(1)`.


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