Which of the following is correct? (A) Kjeldahal’s method of estimation of nitrogen is not applicable to the compounds containing nitrogen in nitro groups, azo groups and nitrogen present in the ring.

Question

Which of the following is correct?

(A) Kjeldahal’s method of estimation of nitrogen is not applicable to the compounds containing nitrogen in nitro groups, azo groups and nitrogen present in the ring.
(B) In Duma’s method of estimation of nitrogen, the organic compound containing nitrogen is heated with Cu2O in an atmosphere of CO2, to yield H2O, CO2 and free N2 gas along with free copper.
(C) During Carius method of estimation of halogen, a known mass of organic compound is heated with dil. HNO3, in presence of AgNO3.
(D) Phosphorous can not be detected by Lassaigne’s test.

Prashant Kotian · Accepted Answer

Correct answer:

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