JEE Main 2021 · ChemistryMultiple choiceOtherEasyApplication

JEE Main 25 July 2021, Shift 1, Chemistry Q38

Question 38 of 90 in this shift, Chemistry question 8 of 30, Section A.

The correct order of following 3d metal oxides, according to their oxidation numbers is : (a)

\mathrm{CrO_3}

(b)

\mathrm{Fe_2O_3}

(c)

\mathrm{MnO_2}

(d)

\mathrm{V_2O_5}

(e)

\mathrm{Cu_2O}

(1)(a) > (c) > (d) > (b) > (e)
(2)(a) > (d) > (c) > (b) > (e)Official answer
(3)(d) > (a) > (b) > (c) > (e)
(4)(c) > (a) > (d) > (e) > (b)

Official answer

Option 2

NTA final key.

Chapter: The d- and f-Block Elements
Topic: d-Block Elements
Idea tested: Oxidation State Trends

Same idea in other shifts

Asked 4× in all

3 Apr 2025, Shift 2 · Q61Given below are two statements: Statement I : $\mathrm{CrO_3}$ is a stronger oxidizing agent than $\mathrm{MoO_3}$ Statement II : Cr(VI)…MediumTwo statements
9 Apr 2024, Shift 2 · Q69Give below are two statements : Statement I : The higher oxidation states are more stable down the group among transition elements unlike…MediumTwo statements
8 Apr 2023, Shift 2 · Q89The sum of oxidation state of the metals in $\mathrm{Fe(CO)_5}$ , $\mathrm{VO^{2+}}$ and $\mathrm{WO_3}$ is ____________.EasyNumerical value

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.