Q. Given below are two statements: Statement I: In Lassaigne's test, the covalent organic molecules are transformed into ionic compounds. Statement II: The sodium fusion extract of an organic compound having N and S gives prussian blue colour with $\mathrm{FeSO_4}$ and $\mathrm{Na_4[Fe(CN)_6]}$. In the light of the above statements, choose the correct answer from the options given below.
A) Statement I is true but Statement II is false
B) Both Statement I and Statement II are false
C) Both Statement I and Statement II are true
D) Statement I is false but Statement II is true
Explanation
[Solution by Dr. Abubacker] Sodium fusion converts covalent N, S and halogens into ionic NaCN, Na₂S and NaX, so Statement I is true. When both N and S are present, the extract gives a blood-red colour (Fe(SCN)²⁺) with Fe³⁺, not Prussian blue, so Statement II is false. Answer (1).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.