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IIT JEE Advanced 2006 Paper 1

Paragraph for Questions 30–32:
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− → Ag ; Ered+ = 0.8 V
C6H12O6+H2O → Gluconic acid (C6H12O7)+2H++2e− ;
Ered° = - 0.05 V
Ag(NH3)2++e− → Ag (s) + 2NH3 ; Ered° = 0.337 V
[Use 2.303 ×

= 0.0592 and

= 38.92 at 398 K]

Question : 72

Total: 120

Ammonia is always is added in this reaction. Which of the following must be incorrect?

NH3 combines with Ag+ to form a complex.
Ag(NH3)2+ is a stronger oxidising reagent 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.

Validate

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