JEE Main 2021 · ChemistryMultiple choiceSingle correctMediumRecall

JEE Main 24 February 2021, Shift 2, Chemistry Q38

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

The

\textbf{incorrect}

statement among the following is :

(1) $\mathrm{VOSO_4}$ is a reducing agent
(2) $\mathrm{RuO_4}$ is an oxidizing agent
(3) $\mathrm{Cr_2O_3}$ is an amphoteric oxide
(4)Red colour of ruby is due to the presence of $\mathrm{Co^{3+}}$ Official answer

Official answer

Option 4

NTA final key.

Chapter: The d- and f-Block Elements
Topic: d-Block Elements
Idea tested: Acid-Base Character of Oxides

Same idea in other shifts

Asked 8× in all

4 Apr 2025, Shift 2 · Q59'X' is the number of electrons in $\mathrm{t_{2g}}$ orbitals of the most stable complex ion among $\mathrm{[Fe(NH_3)_6]^{3+}}$ ,…MediumSingle correct
7 Apr 2025, Shift 1 · Q61The first transition series metal 'M' has the highest enthalpy of atomisation in its series. One of its aquated ion ( $\mathrm{M^{n+}}$ )…MediumSingle correct
7 Apr 2025, Shift 2 · Q61'X' is the number of acidic oxides among $\mathrm{VO_2}$ , $\mathrm{V_2O_3}$ , $\mathrm{CrO_3}$ , $\mathrm{V_2O_5}$ and $\mathrm{Mn_2O_7}$ .…MediumSingle correct
4 Apr 2024, Shift 2 · Q86A first row transition metal with highest enthalpy of atomisation, upon reaction with oxygen at high temperature forms oxides of formula…MediumNumerical value
31 Jan 2024, Shift 2 · Q69Choose the correct statements from the following A. $\mathrm{Mn_2O_7}$ is an oil at room temperature B. $\mathrm{V_2O_4}$ reacts with acid…MediumOther
27 Aug 2021, Shift 1 · Q40The nature of oxides $\mathrm{V_2O_3}$ and CrO is indexed as ‘X’ and ‘Y’ type respectively. The correct set of X and Y is :EasySingle correct
2 Apr 2017 (offline) · Q47In the following reactions, ZnO is respectively acting as a/an : (a) $\mathrm{ZnO+Na_2O\rightarrow Na_2ZnO_2}$ (b)…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.