Tollen’s reagent is used for the detection of aldehydes. When a solution of AgNO 3 is…

Chemistry · JEE Advanced · NTA ExamsElectrochemistry


Tollen’s reagent is used for the detection of aldehydes. When a solution of AgNO3 is added to glucose with NH4OH, then gluconic acid is formed.
Ag+ + e → Ag; \(\mathrm{E}_{\mathrm{red}}^{\mathrm{o}}\)= 0.80 V
C6H12O6 + H2O → \(\underset{\text { gluconic acid }}{\mathrm{C}_{6} \mathrm{H}_{12} \mathrm{O}_{7}}\)+ 2H+ + 2e;
\(\mathrm{E}_{\text {oxidation }}^{\mathrm{o}}\) = – 0.05 V
\(\mathrm{Ag}\left(\mathrm{NH}_{3}\right)_{2}^{+}+\mathrm{e}^{-}\)\(\text { → }\) Ag (s) + 2NH3; \(\mathrm{E}_{\mathrm{red}}^{\mathrm{o}}\) = 0.337V
[Use 2.303 × \(\frac{\mathrm{RT}}{\mathrm{~F}}\)= 0.0592 and \(\frac{\mathrm{F}}{\mathrm{RT}}\) = 38.92 at 298 K]
(2006)
Ammonia is always added in this reaction. Which of the following must be incorrect ?
  1. NH3 combines with Ag+ to form a complex
  2. Ag(NH3)+2 is a stronger oxidising reagent than Ag+
  3. In absence of NH3 silver salt of gluconic acid is formed
  4. NH3 has affected the standard reduction potential of glucose/gluconic acid electrode

Answer

(D) NH 3 has affected the standard reduction potential of glucose/gluconic acid electrode

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