Saved Bookmarks
| 1. |
`E^(c-)._(red)` of different half cell are given as `:` `E^(c-)._(Cu^(2+)|Cu)=0.34V,E^(c-)._(Zn^(2+)|Zn)=-0.76V`. `E^(c-)._(Ag^(o+)|Ag)=0.80 V, E^(c-)._(Mg^(2+)|Mg)=-2.37V.` In which cell `DeltaG^(c-)` is most negative ?A. `Zn|Zn^(2+)(1M)||Mg^(2+)(1M)|Mg`B. `Zn|Zn^(2+)(1M)||Ag^(o+)(1M)|Ag`C. `Cu|Cu^(2+)(1M)||Ag^(o+)(1M)|Ag`D. `Ag|Ag^(o+)(1M)||Mg^(2+)(1M)|Mg` |
|
Answer» Correct Answer - b `DeltaG^(c-)=-nFE^(c-)._(cell)` For `DeltaG^(c-)` to be most negative, check for maximum value of `E^(c-)._(cell)`. `a.` `E^(c-)._(cell)=(E^(c-)._(red))_(c)-(E^(c-)._(red))_(a)=-2.37-(-0.76)` `=-1.61V` `b.` `E^(c-)._(cell)=0.80V-(0.76)=1.56V` `c.` `E^(c-)._(cell)=0.80V-0.34=0.46V` `d.` `E^(c-)._(cell)=-2.37-0.80=-3.17` |
|