Question

`E^(@) (SRP)` of different half cell given
`{:(E_(Cu^(2+)//Cu)^(@) =0.34"volt",,,E_(Zn^(2+)//Zn)^(@) =- 0.76"volt"),(E_(Ag^(+)//Ag)^(@) = 0.8"volt",,,E_(Mg^(2+)//Mg)^(@) =- 2.37 "volt"):}`
In which cell `Delta^(@)` is most negative:-
A. `Zn(s) |Zn^(2+)(1M)||Mg^(2+) (1M)|Mg(s)`
B. `Zn(s) |Zn^(2+)(1M)||Ag^(+)(1M)|Ag(s)`
C. `Cu(s)|Cu^(2+)(1M)||Ag^(+)(1M)|Ag(s)`
D. `Ag(s)|Ag^(+)(1M)||Mg^(2+)(1M)|Mg(s)`

Answer 1

Correct Answer - B
For (A) and (D) `E_("cell")^(@)=-veimplies Delta G^(@)= +ve`
`{:("for"(C),,E_("cell")^(@)= +0.46),("for"(B),,E_("cell")^(@)= +1.56):}`
`Delta G^(@)` is most negative for (B).