JEE Main 2025 Jan 23 Shift 1, Chemistry Q17: Principles Of Qualitative Analysis

JEE Main2025Jan 23, Shift 1Chemistry

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 $F e S O_{4}$ and $N a_{4} [F e (C N)_{6}]$

In the light of the above statements, choose the correct answer from the options given below

A
Both Statement I and Statement II are true
B
Both Statement I and Statement II are false
C
Statement I is false but Statement II is true
D
Statement I is true but Statement II is false

Solution

Statement I: In Lassaigne's test, the organic sample is fused with metallic sodium. Covalent C, N, S, X get converted into ionic species ( $N a C N$ , $N a_{2} S$ , $N a X$ ) which then go into the aqueous extract. True.

Statement II: When N and S are present together, sodium fusion gives $N a S C N$ , which with $F e^{3 +}$ produces a blood-red colour, not Prussian blue. (Prussian blue is the test for N alone.) False.

$∴$ Statement I is true, Statement II is false.

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JEE Main 2025 Jan 23 Shift 1, Chemistry Q17: Principles Of Qualitative Analysis

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