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Tollen's reagent is used for the detecti...

Tollen's reagent is used for the detection of aldehyde when a solution of `AgNO_(3)` is added to glucose with `NH_(4)OH` then gluconic acid is formed
`Ag^(+) + e^(-) rarr Ag , E_("red")^(@)= 0.8V`
`C_(6)H_(12)O_(6) + e^(-) rarr C_(6)H_(12) O_(7)` (Gluconic acid) `+2H^(+) + 2e^(-) , E_("red")^(@)= -0.05V`
`Ag(NH_(3))_(2)^(+) + e^(-) rarr Ag(s) + 2NH_(3) , E^(@)= -0.337V`
[Use `2.303 xx (RT)/(F)= 0.0592 and (F)/(RT)= 38.92` at 298K]
Ammonia is always added in this reaction. Which of the following must be incorrect ?

A

`66.13`

B

`58.35`

C

`28.30`

D

`46.29`

Text Solution

Verified by Experts

The correct Answer is:
A
We know `E_("cell")^(@) = (RT)/(nF)ln K`. Substituting values, we get
`0.8 - (-0.05) = (1)/(2) xx (0.0591)/(2.303) ln K = 0.85 xx 2 xx (2.303)/(0.0592)= 66.13`
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