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A compound which does not give a positiv...

A compound which does not give a positive test in Lassaigne's test for nitrogen is:

A

Sodium cyanide

B

Hydroxyl amine

C

Hydrazine

D

Ammonia

Text Solution

Verified by Experts

The correct Answer is:
A
A positive Lassaigne's test for nitrogen is due to the formation of NaCN during fusion. As Hydroxylamine `(NH_2OH)`, hydrazine `(H_2N-NH_2)` and ammonia `(NH_3)` has no carbon, no NACN is formed during sodium fusion in these cases. Therefore NaCN will only give a positive test for nitrogen:
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