JEE Main 2025 · ChemistryMultiple choiceSingle correctEasyRecall

JEE Main 2 April 2025, Shift 2, Chemistry Q62

Question 62 of 75 in this shift, Chemistry question 12 of 25, Section A.

Formation of

\mathrm{Na_4[Fe(CN)_5NOS]}

, a purple coloured complex formed by addition of sodium nitroprusside in sodium carbonate extract of salt indicates the presence of :

(1)Sulphate ion
(2)Sodium ion
(3)Sulphide ionOfficial answer
(4)Sulphite ion

Official answer

Option 3

NTA final key.

Chapter: Organic Chemistry: Some Basic Principles and Techniques
Topic: Anion Analysis
Idea tested: Sulfide Sodium Nitroprusside Test

Same idea in other shifts

Asked 4× in all

28 Jun 2022, Shift 1 · Q80The formula of the purple colour formed in Laissaigne’s test for sulphur using sodium nitroprusside isEasySingle correct
4 Aug 2021, Shift 2 · Q50The reagent that gives purple coloured complex with $\mathrm{S^{2-}}$ ion isEasySingle correct
26 Aug 2021, Shift 1 · Q41Which one of the following complexes is violet in colour ?MediumSingle correct

Question text from the official JEE Main paper published by NTA; answer from the final answer key. Chapter, topic and idea tags, difficulty and skill are Lumi’s. Lumi analyses 108 of the 174 JEE Main shifts held from 2017 to 2026.