InterviewSolution
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InterviewSolution
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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_("oxd")^(@)` glucose will increase by a factor of `0.463 V`B. `E_("oxd")^(@)` glucose decrease by a factor of `0.463 V`C. `E_(red)^(@)Ag^(+)` will increase by a factor of `0.463 V`.D. `E_(red)^(@)Ag^(+)` will decrease by a factor of `0.463 V`. |
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Answer» Correct Answer - D `E^(@)` of `Ag^(+)//Ag = 0.8 V` `E^(@)` of `Ag^(+)//Ag` in `NH_(3) = 0.337 V` |
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