Home
Class 12
CHEMISTRY
Tollen reagent is used for the detection...

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

A

`E_("ox")` increased by `E_("ox")^(@)` by 0.65 V

B

`E_("ox")` decreased by `E_("ox")^(@) ` by 0.65 V

C

`E_(red)` increased by `E_(red)^(@) ` by 0.65 V

D

`E_(red)` decreased by `E_(red)^(@)` by 0.65 V

Text Solution

Verified by Experts

The correct Answer is:
A
`E = E^(Theta) - (RT)/(2 F) ln [H^(+)]^(2)`
`= E^(Theta) - (2)/(38.9 xx 2) ln [H^(+)]`
`= E^(Theta) + (2.303)/(38.9) pH `
`or E = E^(Theta) + (2.303)/(38.9) xx 11`
=` E^(Theta) + 0.65`
`E - E^(Theta) = 0.65 V `
Promotional Banner

Topper's Solved these Questions

  • ELECTROCHEMISTRY

    MODERN PUBLICATION|Exercise COMPETITION FILE (OBJECTIVE TYPE QUESTIONS) MATRIX MATCH TYPE QUESTIONS|3 Videos

  • ELECTROCHEMISTRY

    MODERN PUBLICATION|Exercise COMPETITION FILE (OBJECTIVE TYPE QUESTIONS)Matching Type Questions|1 Videos

  • ELECTROCHEMISTRY

    MODERN PUBLICATION|Exercise COMPETITION FILE (OBJECTIVE TYPE QUESTIONS) C MULTIPLE CHOICE QUESTIONS|10 Videos

  • D AND F-BLOCK ELEMENTS

    MODERN PUBLICATION|Exercise UNIT PRACTICE TEST|12 Videos

  • GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

    MODERN PUBLICATION|Exercise COMPETION FILE (Integer Type Numerical Value Type Questions)|5 Videos

Similar Questions

Explore conceptually related problems

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 followijng must be wrong ?

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 ] 2Ag^(o+)+C_(6)H^(12)O_(6)+H_(2)O rarr 2Ag^(s)+C_(6)H_(12)O_(7)+2H^(o+) Find lnK of this reaction.