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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 : 71

Total: 120

When ammonia is added to the solution, pH is raised to 11. Which half- cell reaction is affected by pH and by how much?

Eoxd will increase by a factor of 0.65 from Eoxd+
Eoxd will decrease by a factor of 0.65 from Eoxd+
Ered will increase by a factor of 0.65 from Ered+
Ered will decrease by a factor of 0.65 from Ered+

Validate

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