A first row transition metal with highest enthalpy of atomisation, upon reaction with oxygen at high temperature forms oxides of formula M 2 O 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)

Chemistry · d and f Block Elements

JEE Main 2024 — 4 April, Shift 2 — Question 82

A first row transition metal with highest enthalpy of atomisation, upon reaction with oxygen at high temperature forms oxides of formula $\mathrm{M}_{2} \mathrm{O}_{\mathrm{n}}$ (where $\mathrm{n}=3,4,5$ ). The 'spin-only' magnetic moment value of the amphoteric oxide from the above oxides is $\qquad$ BM (near integer) (Given atomic number : $\mathrm{Sc}: 21, \mathrm{Ti}: 22, \mathrm{~V}: 23$ , $\mathrm{Cr}: 24, \mathrm{Mn}: 25, \mathrm{Fe}: 26$ , Co : 27, Ni : $28, \mathrm{Cu}: 29$ , $\mathrm{Zn}: 30)$

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Step-by-step solution

V' has highest enthalpy of atomisation ( $515 \mathrm{~kJ} / \mathrm{mol}$ )

among first row transition elements.

$\mathrm{V}_{2} \mathrm{O}_{5}$

Here ' V ' is in +5 oxidation state $\mathrm{V}^{+5} \Rightarrow 1 \mathrm{~s}^{2} 2 \mathrm{~s}^{2} 2 \mathrm{p}^{6} 3 \mathrm{~s}^{2} 3 \mathrm{p}^{6}$ (no unpaired electrons)

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Exam: JEE Main 2024
Paper: 4 April, Shift 2
Subject: Chemistry
Chapter: d and f Block Elements
Topic: Introduction and Properties of Transition Elements

A first row transition metal in its +2 oxidation state has a spin-only magnetic moment value of 3.86 BM . The atomic number of the metal is

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