JEE Main 2021 · ChemistryMultiple choiceSingle correctMediumConceptual

JEE Main 3 August 2021, Shift 2, Chemistry Q39

Question 39 of 90 in this shift, Chemistry question 9 of 30, Section A.

Which one of the following statements is correct?

(1) $\mathrm{Ce^{4+}}$ is more stable than $\mathrm{Ce^{3+}}$ due to $4f^0$ configuration.
(2) $\mathrm{Eu^{2+}}$ is more stable than $\mathrm{Eu^{3+}}$ due to $4f^7$ configuration.
(3) $\mathrm{Ce^{4+}}$ is an oxidant and $\mathrm{Eu^{2+}}$ is a reducing agent.Official answer
(4) $\mathrm{Ce^{3+}}$ and $\mathrm{La^{3+}}$ salts are colored and paramagnetic.

Official answer

Option 3

NTA final key.

Chapter: The d- and f-Block Elements
Topic: f-Block Elements
Idea tested: Cerium(IV) as an Oxidizing Agent

Same idea in other shifts

Asked 4× in all

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.