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Borax

Which of the ...

Question

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

A

Urea

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B

Azobenzene

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C

Hydrazine

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D

Phenylhydrazine

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Solution

The correct option is C Hydrazine
Hydrazine ( $N H_{2} N H_{2}$ ) does not contain carbon. On fusion with $N a$ metal, it cannot form $N a C N$ . So, hydrazine does not show Lassaigne's test.

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