Direction for: In each of the following questions a statement of Assertion is given followed by a corresponding statement of Reason just below it. Of the statements mark the correct answer as
Assertion: During test for nitrogen with Lassaigne extract on adding \[FeC{{l}_{3}}\] solution sometimes a red precipitate is obtained. Reason: Sulphur is also present.A) If both Assertion and Reason are true and Reason is the correct explanation of Assertion.
B) If both Assertion and Reason are true but Reason is not the correct explanation of Assertion.
C) If Assertion is true but Reason is false.
D) If both Assertion and Reason are false.
Correct Answer: A
Solution :
On adding \[FeC{{l}_{3}}\] solution to sodium extract during testing for nitrogen a red precipitate is obtained due to the presence of sulphur \[3NaCNS+FeC{{l}_{3}}\xrightarrow{{}}\underset{red\,\,colour}{\mathop{Fe{{(CNS)}_{3}}}}\,+3NaCl\]
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