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Saturday, 31 October

JEE Main 2024 · ChemistryNumerical answerNumerical valueMediumMulti-step

JEE Main 4 April 2024, Shift 2, Chemistry Q86

Question 86 of 90 in this shift, Chemistry question 26 of 30, Section B.

A first row transition metal with highest enthalpy of atomisation, upon reaction with oxygen at high temperature forms oxides of formula M2On\mathrm{M_2O_n} (where n = 3, 4, 5). The 'spin-only' magnetic moment value of the amphoteric oxide from the above oxides is ______ BM (near integer) (Given atomic number : Sc : 21, Ti : 22, V : 23, Cr : 24, Mn : 25, Fe : 26, Co : 27, Ni : 28, Cu : 29, Zn : 30)

Official answer

0

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
  1. 4 Apr 2025, Shift 2 · Q59'X' is the number of electrons in t2g\mathrm{t_{2g}} orbitals of the most stable complex ion among [Fe(NH3)6]3+\mathrm{[Fe(NH_3)_6]^{3+}},…MediumSingle correct
  2. 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 (Mn+\mathrm{M^{n+}})…MediumSingle correct
  3. 7 Apr 2025, Shift 2 · Q61'X' is the number of acidic oxides among VO2\mathrm{VO_2}, V2O3\mathrm{V_2O_3}, CrO3\mathrm{CrO_3}, V2O5\mathrm{V_2O_5} and Mn2O7\mathrm{Mn_2O_7}.…MediumSingle correct
  4. 31 Jan 2024, Shift 2 · Q69Choose the correct statements from the following A. Mn2O7\mathrm{Mn_2O_7} is an oil at room temperature B. V2O4\mathrm{V_2O_4} reacts with acid…MediumOther
  5. 27 Aug 2021, Shift 1 · Q40The nature of oxides V2O3\mathrm{V_2O_3} and CrO is indexed as ‘X’ and ‘Y’ type respectively. The correct set of X and Y is :EasySingle correct
  6. 24 Feb 2021, Shift 2 · Q38The incorrect\textbf{incorrect} statement among the following is :MediumSingle correct
  7. 2 Apr 2017 (offline) · Q47In the following reactions, ZnO is respectively acting as a/an : (a) ZnO+Na2O→Na2ZnO2\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.