1.

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

Answer»

`E_(2)gtE_(3)gtE_(1)`
`E_(3)gtE_(2)gtE_(1)`
`E_(1)gtE_(2)gtE_(3)`
`E_(1)gtE_(3)gtE_(2)`

Solution :Emf of the CELL `=E_("cell")^(@)-(0.0591)/(n)log_(10)[(Zn^(2+))/(CU^(2+))]`
Higher the `([Zn^(2+)])/([Cu^(2+)])` ratio lower is the emf 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, ORDER is `E_(3)gtE_(2)gtE_(1)`.


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