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 ]`
Ammonia is always added in this reaction. Which of the following must be correct ?
(a)`NH_(3)` combines with `Ag^(o+)` to form a complex.
(b)`[Ag(NH_(3))_(2)]^(o+)` is a stronger oxidizing reagent than `Ag^(o+)`
(c)Both a and b
(d)None of these

Options

A. `NH_(3)` combines with `Ag^(+)` to form a complex
B. `Ag(NH_(3))_(2)^(+)` is a weaker oxidising reagent than `Ag^(+)`
C. In absence of `NH_(3)`, silver salt of gluconic aacid is formed.
D. `NH_(3)` has affected the standard reduction potential of glucose/gluconic acid electrode.

Answer

D

Explanation

Standards electrode potential does not depend upon on concentration.