Assertion: During test for nitrogen with Lassaigne extract on adding  solution sometimes a red precipitate is obtained. |
| Reason: Sulphur is also present. [AIIMS 2001] |
| Read the assertion and reason carefully to mark the correct option out of the options given below: |
A) If both assertion and reason are true and the reason is the correct explanation of the assertion.
B) If both assertion and reason are true but reason is not the correct explanation of the assertion.
C) If assertion is true but reason is false.
D) If the assertion and reason both are false.
E) If assertion is false but reason is true.
Correct Answer: A
Solution :
[a] On adding \[FeC{{l}_{3}}\] solution to sodium extract during testing for nitrogen a red precipitate is obtained. It is due to the presence of sulphur also. \[3NaCNS+FeC{{l}_{3}}\xrightarrow{{}}\underset{\text{Red colour}}{\mathop{Fe{{(CNS)}_{3}}+3NaCl}}\,\]
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