Choose 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 to give $\mathrm{VO_2^{2+}}$ C. $\mathrm{CrO}$ is a basic oxide D. $\mathrm{V_2O_5}$ does not react with acid Choose the correct answer from the options given below :

JEE Main 2024 · ChemistryMultiple choiceOtherMediumRecall

JEE Main 31 January 2024, Shift 2, Chemistry Q69

Question 69 of 90 in this shift, Chemistry question 9 of 30, Section A.

Choose 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 to give

\mathrm{VO_2^{2+}}

\mathrm{CrO}

is a basic oxide D.

\mathrm{V_2O_5}

does not react with acid Choose the correct answer from the options given below :

(1)B and C only
(2)A, B and C only
(3)A, B and D only
(4)A and C onlyOfficial 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 5× 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
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 42 of the 174 JEE Main shifts held from 2017 to 2026.