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Here paragraphs are given. Based upon th...

Here paragraphs are given. Based upon the paragraphs some multiple choice questions are given. Each question has 4 choices A, B, C and D. Out of which one is correct. Choose the correct option
Paragraph/comprehension
In the detection of elements by Lassaigne’s test, the covalent compounds are converted into ionic compounds on fusion with sodium metal. The nitrogen, sulphur and halides present in the organic compounds are test with their usual tests. In this test blue or green colour is obtained when only nitrogen is present whereas red colour is obtained when both nitrogen and sulphur are present. The Lassaigne’s extract is boiled with `HNO_(3)` so as to decompose `Na_(2)` and NaCN if present. Phosphorus is detected in the organic compound by fusing it with sodium peroxide. When sodium phosphate formed is detected with cone. `HNO_(3)` and ammonium molybdate.
An organic compound containing N, S and O as extra elements is fused with sodium metal and then extracted with water. The species which is not present in the solution of the extract is

A

`CN_(-)`

B

`CNS^(-)`

C

`NO_(3)^(-)`

D

`S^(2-)`

Text Solution

Verified by Experts

The correct Answer is:
C
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