JEE Main 2025 · ChemistryMultiple choiceSingle correctMediumMulti-step

JEE Main 7 April 2025, Shift 2, Chemistry Q61

Question 61 of 75 in this shift, Chemistry question 11 of 25, Section A.

'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}

. The primary valency of cobalt in

\mathrm{[Co(H_2NCH_2CH_2NH_2)_3]_2(SO_4)_3}

is Y. The value of X + Y is __________.

(1)3
(2)2
(3)5Official answer
(4)4

Official answer

Option 3

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
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
24 Feb 2021, Shift 2 · Q38The $\textbf{incorrect}$ statement among the following is :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 108 of the 174 JEE Main shifts held from 2017 to 2026.