Start free

Chemistry · d and f Block Elements

JEE Main 2025 — 3 April, Evening Shift — Question 19

Among, Sc,Mn,Co\mathrm{Sc}, \mathrm{Mn}, \mathrm{Co} and Cu , identify the element with highest enthalpy of atomisation. The spin only magnetic moment value of that element in its +2 oxidation state is _____\_\_\_\_\_ BMB M (in nearest integer).

Answer: 4

Numerical answer — enter this value.

Step-by-step solution

Enthalpy of atomisation of : Sc=326 kJ/mol,Mn=\mathrm{Sc}=326 \mathrm{~kJ} / \mathrm{mol}, \mathrm{Mn}=

281 kJ/mol,Co=425 kJ/mol,Cu=338 kJ/mol281 \mathrm{~kJ} / \mathrm{mol}, \mathrm{Co}=425 \mathrm{~kJ} / \mathrm{mol}, \mathrm{Cu}=338 \mathrm{~kJ} / \mathrm{mol}

$\mathrm{Co}^{2+}:[\mathrm{Ar}] 4 \mathrm{~s}_{0} 3 \mathrm{~d}^{7}:

μ=3(3+2)=15=3.87\mu=\sqrt{3(3+2)}=\sqrt{15}=3.87

Answer key and solution verified before publishing.

Practise d and f Block Elements

Start with this question, then two more from the same chapter — with a tutor that explains every step. Free.

Solve a similar one free
Exam
JEE Main 2025
Paper
3 April, Evening Shift
Subject
Chemistry
Chapter
d and f Block Elements
Topic
Properties of compounds of 3d Series elements + Comparison between 3d, 4d, 5d

More d and f Block Elements questions from this paper

Among, Sc , Mn , Co and Cu , identify the element with highest… | JEE Main 2025 PYQ with Solution · DhiX AI