1.

Assertion : During test for nitrogen with Lassaigne extract on adding FeCl_(3) obtain solution sometimes a red precipitate is obtained. Reason :Sulphur is also present.

Answer»

If both assertion and reason are true and the reason is the correct explanation of the assertion.
If both assertion and reason are true but RESON is not the correct explanation of the assertion.
If assertion is true but reason is false.
If the assertion and reason both are false.

Solution :On ADDING `FeCl_(3)` solution of sodium extrac during testing for nitrogen a red precipitate is obtained. It is due to the presence of SULPHUR also.
`3NaCNS + FeCl_(3) rarr underset(" Red colour")(Fe(CNS)_(3) + 3NaCl)`


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