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Nitrogen can be estimated by Kjeldahl's ...

Nitrogen can be estimated by Kjeldahl's method for which of the following compound ?

A

B

C

D

Text Solution

Verified by Experts

The correct Answer is:
B
Kjeldahl's method for nitrogen estimation is not applicable to nitro compounds such as nitrobenzene and compounds containing nitrogens in the ring such as pyridine, since during digestion, there are not completely converted into `(NH_(4))_(2)SO_(4)`. Furthermore, diazonium salts lose `N_(2)` on heating during digestion. Thus, Kjeldahl's method for nitrogen estimation is only applicable to aniline, i.e, option (b) is correct.
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Knowledge Check

  • The Kjeldahl method of Nitrogen estimation fails for which of the following reaction products?

    A
    (a), (c) and (d)
    B
    (b) and (c)
    C
    (c) and (d)
    D
    (a) and (d)

  • (A) Nitrogen cannot be estimated in nitrobenzene by Kjeldahl's method. (R) Nitrobenzene evolves ammonia gas on acid treatment.

    A
    If both assertion and reason are correct and reason is the correct explanation of the assertion
    B
    If both assertion and reason are correct but reason is not the correct explanation of the assertion
    C
    If assertion is correct but reason is incorrect
    D
    If assertion is incorrect but reason is correct

  • In Kjeldahl's method for the estimation of nitrogen, the formula used is

    A
    `" percentage of N "=(1.4xxVxxW)/N`
    B
    `" percentage of N "=(1.4xxNxxW)/V`
    C
    `" percentage of N "=(VxxNxxW)/1.4`
    D
    `" percentage of N "=(1.4xxNxxV)/W`

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    Catalyst used in Kjeldahl's method for the estimation of nitrogen is :

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