Tollen reagent is used for the detection of aldehydes. When a solution of `AgNO_(3)` is added to glucose with `NH_(4)OH`, then gluconic acid is formed.
`Ag^(o+)+e^(-) rarr Ag," "E^(c-)._(red)=0.8V`
`C_(6)H_(12)O_(6)rarr underset(Gluconic aci d)(C_(6)H_(12)O_(7)+)2H^(o+)+2e^(-) , " "E^(c-)._(o x i d ) =-0.05V`
`[Ag(NH_(3))_(2)]^(o+)+e^(-) rarr Ag(s)+2NH_(3), " "E^(c-)._(red)=0.337V`
`[Use2.303xx(RT)/(F)=0.0592` and `(F)/(RT)=38.92at 298 K ]`
When ammonia is added to the solution, `pH` is raised to `11`. Which half cell reaction is affected by `pH` and by how much ?

Options

A. `E_("oxd")^(@)` glucose will increase by a factor of `0.463 V`
B. `E_("oxd")^(@)` glucose decrease by a factor of `0.463 V`
C. `E_(red)^(@)Ag^(+)` will increase by a factor of `0.463 V`.
D. `E_(red)^(@)Ag^(+)` will decrease by a factor of `0.463 V`.

Answer

D

Explanation

`E^(@)` of `Ag^(+)//Ag = 0.8 V`
`E^(@)` of `Ag^(+)//Ag` in `NH_(3) = 0.337 V`