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JEE Main 2026 · ChemistryMultiple choiceSingle correctEasyRecall

JEE Main 5 April 2026, Shift 2, Chemistry Q70

Question 70 of 75 in this shift, Chemistry question 20 of 25, Section A.

A paper dipped in a dil.

\mathrm{H_2SO_4}

solution of 'X' upon treatment with

\mathrm{SO_2}

gas turns into green. The compound 'X' is :

(1)KI-starch
(2) $\mathrm{KMnO_4}$
(3) $\mathrm{Pb(CH_3COO)_2}$
(4) $\mathrm{K_2Cr_2O_7}$ Official answer

Official answer

Option 4

NTA final key.

Chapter: The p-Block Elements
Topic: Anion Analysis
Idea tested: Sulfite Dichromate Paper Test

Same idea in other shifts

Asked 2× in all

26 Feb 2021, Shift 1 · Q50On treating a compound with warm dil. $\mathrm{H_2SO_4}$ , gas X is evolved which turns $\mathrm{K_2Cr_2O_7}$ paper acidified with dil.…EasySingle 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.