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Assignment on Qualitative Elemental Analysis

Which of the following compounds does not show Lasseigne's test for nitrogen?

(a) Urea

(b) Hydrazine

© Phenylhydrazine

(d) Azobenzene

Diazo compounds, sometimes do not respond to Lassaigne’s test for nitrogen because

(a) these are quite stable compounds and do not decompose to elemental nitrogen

(b) these contain very little carbon

© these form organometallic compounds with sodium

(d) their nitrogen contents is removed, during heating, in the form of nitrogen gas

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