Tollen’s reagent is used for the detection of aldehyde when a solution of AgNO 3 is added…
Chemistry · JEE Advanced · NTA Exams — Electrochemistry
Tollen’s reagent is used for the detection of aldehyde when a solution of AgNO3 is added to glucose with NH4OH then gluconic acid is formed.
Ag+ + e–
C6H12O6 + H2O
Ag(NH3)2+ + e–
[Use
- NH3 combines with Ag+ to form a complex.
- [Ag(NH3)2]+ is a stronger oxidising agent than Ag+.
- In absence of NH3 silver salt of gluconic acid is formed.
- NH3 has affected the standard reduction potential of glucose/gluconic acid electrode.
Answer
(B) [Ag(NH 3 ) 2 ] + is a stronger oxidising agent than Ag + .
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