Home
Class 12
CHEMISTRY
E(1), E(2) and E(3) are the emfs of the ...

`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)`

A

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

B

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

C

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

D

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

Text Solution

Verified by Experts

The correct Answer is:
B
`Zn+Cu^(2+)rarrZn^(2+)+Cu`
`E_("cell")=E_("cell")^(@)-(0.0591)/(2)"log"([Zn^(2+)])/([Cu^(2+)])`
Lesser the `[Zn^(2+)]//[Cu^(2+)]` value more will be `E_("cell")`
for (i) `([Zn^(2+)])/([Cu^(2+)])=(1)/(01)=10`
for (ii) `([Zn^(2+)])/([Cu^(2+)])=(1)/(1)=1` and
for (iii) `([Zn^(2+)])/([Cu^(2+)])=(01)/(1)=0.1`
Hence `E_(3)gtE_(2)gtE_(1)`
Promotional Banner

Similar Questions

Explore conceptually related problems

The e.m.f. ( E^(0) )of the following cells are Ag| Ag^(+)(1M) | | Cu^(2+)(1M) | Cu, E^(0) = -0.46V , Zn|Zn^(2+)(1M)| | Cu^(2+)(1M) | Cu : E^(0) = +1.10V Calculate the e.m.f. of the cell Zn | Zn^(2+)(1M) | | Ag^(+)(1M) | Ag

Find the emf of the cell Zn(s)|Zn^(+2)(0.01 M)|KCI "saturated" |Zn^(+2)(1.0 M)|Zn(s)

Find the emf of the cell Zn(s)|Zn^(+2)(0.01 M)|KCI "saturated" |Zn^(+2)(1.0 M)|Zn(s)

Write Nernst equation for the following cell reaction : Zn"|"Zn^(2+)(aq)"||"Cu^(2+)(aq)"|"Cu(s)

The value of reaction quotient Q for the cell Zn(s)|Zn^(2+)(0.01M)||Ag^(o+)(1.25M)|Ag(s) is

Which of the following alloys contain (s) Cu and Zn?

E.M.F. of Ni(s) | Ni^(2+) (aq)||Cu^(2+) (aq)| Cu(s) cell can be increased by

Calculate the maximum work that can be obtained from the daniell call given below, Zn(s)|Zn^(2+)(aq)||Cu^(2+)(aq)|Cu(s) . Given that E_(Zn^(2+)//Zn)^(@)=-0.76V and E_(Cu^(2+)//Cu)^(@)=+0.34V .

The standard reduction potential of Pb and Zn electrodes are -0.12 6 and -0.763 volts respectively . The e.m.f of the cell Zn|Zn^(2+)(0.1M)||Pb^(2+)(1M)|Pb is

Write expression of E_(cell) in each of the following cell (i) Zn(s)|ZnSO_(4)(C_(1)M)||CuSO_(4)(C_(2)M)|Cu(s),E_(cell) (ii) Pt|H_(2)(P_(1)atm)||HCl(C_(1)M)|AgCI(s)|Ag,E_(cell) (iii) Pt|Fe^(2+)(C_(1)M),Fe^(+3)(C_(2)M)||Ag^(+)(CM)|Ag,E_(cell)