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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 gluose with `NH_4OH` then gluconic acid is formed
`Ag^(+) + e^(-) to ag, E_(1)^(@) = 0.8 V , C_6H_(12)O_6 + H_2O to "Gluconic acid "`
`(C_6 H_(12)O_7) + 2H^(+) + 2e^(-) , E_(2)^(@) = -0.05 V , [Ag(NH_3)_2]^(+) e^(-) to Ag(s) + 2NH_3`,
[Use , `2.303 xx (RT)/(F) = 0.0592 and (F)/(RT) = 38.92 "at " 298 K`]
Ammonia is always added in this reaction . Which of the following must be incorrect ?

A

`NH_3` combines with `Ag^(+)` to form a complex

B

`[Ag(NH_3)_2]^(+)` is a weaker oxidising reagent than `Ag^(+)`

C

In absence of `NH_3` silver salt of gluconic acid is formed

D

`NH_3` has affected the standard reduction potential of glucose/ gluconic acid electrode

Text Solution

Verified by Experts

The correct Answer is:
C
In absence of `NH_3` siver salt of gluconic acid is formed
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Tollen's reagent is used for the detection of aldehyde when a solution of AgNO_3 is added to gluose with NH_4OH then gluconic acid is formed Ag^(+) + e^(-) to ag, E_(1)^(@) = 0.8 V , C_6H_(12)O_6 + H_2O to "Gluconic acid " (C_6 H_(12)O_7) + 2H^(+) + 2e^(-) , E_(2)^(@) = -0.05 V , [Ag(NH_3)_2]^(+) e^(-) to Ag(s) + 2NH_3 , [Use , 2.303 xx (RT)/(F) = 0.0592 and (F)/(RT) = 38.92 "at " 298 K ] When ammonia is added to the solution , pH is raised to 11 . Which is affected by pH amount by how much ?

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