JEE Main 2024 · ChemistryMultiple choiceSingle correctMediumApplication

JEE Main 29 January 2024, Shift 1, Chemistry Q79

Question 79 of 90 in this shift, Chemistry question 19 of 30, Section A.

In chromyl chloride test for confirmation of

\mathrm{Cl^-}

ion, a yellow solution is obtained. Acidification of the solution and addition of amyl alcohol and 10%

\mathrm{H_2O_2}

turns organic layer blue indicating formation of chromium pentoxide. The oxidation state of chromium in that is

(1) $+10$
(2) $+6$ Official answer
(3) $+3$
(4) $+5$

Official answer

Option 2

NTA final key.

Chapter: Redox Reactions
Topic: Anion Analysis
Idea tested: Chromate Hydrogen Peroxide Test

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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 42 of the 174 JEE Main shifts held from 2017 to 2026.