Home
Class 12
CHEMISTRY
If E(1),E(2) and E(3) are the emf values...

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

A

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

B

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

C

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

D

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

Text Solution

Verified by Experts

The correct Answer is:
B
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)`.
Promotional Banner

Similar Questions

Explore conceptually related problems

E_(1) , E_(2) and E_(3) are the emfs of the following three galvanic cells respectively I. Zn((s)) | Zn^(2+) (0.1M) | | CU^(2+) (1M) | Cu((s)) II. Zn((s)) ZN^(2+) (1M) || Cu^(2+)(1M) | Cu(s) III. Zn(s) | Zn^(2+) (1M) || CU^(2+)(0.1M)CU(s)

The emf of the following three galvanic cells : 1. Zn//Zn^(2+) ( 1M) || Cu^(2+) (1 M) //Cu 2. Zn//ZN^(2+ ) (1 M)|| Cu^(2+) //cu 3. Zn//Zn^(2+) (1 M) || Cu^(2+) (0.1 M) Cu are repersented by E_1, E_2, E_3 which of the following statement is true ?