JEE Main 2024 · ChemistryNumerical answerNumerical valueEasyRecall

JEE Main 31 January 2024, Shift 2, Chemistry Q90

Question 90 of 90 in this shift, Chemistry question 30 of 30, Section B.

In the reaction of potassium dichromate, potassium chloride and sulfuric acid (conc.), the oxidation state of the chromium in the product is (+)_________.

Official answer

NTA final key.

Chapter: The d- and f-Block Elements
Topic: d-Block Elements
Idea tested: Chromyl Chloride Test Reactions

Same idea in other shifts

Asked 3× in all

27 Jan 2024, Shift 1 · Q80NaCl reacts with conc. $\mathrm{H_2SO_4}$ and $\mathrm{K_2Cr_2O_7}$ to give reddish fumes (B), which react with NaOH to give yellow…MediumSingle correct
30 Jan 2024, Shift 2 · Q80A and B formed in the following reactions are: $\mathrm{CrO_2Cl_2} + 4\mathrm{NaOH} \to A + 2\mathrm{NaCl} + 2\mathrm{H_2O}$ …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.