Chemistry · d and f Block Elements

JEE Main 2026 — 22 January, Evening Shift — Question 49

Given below are two statements : one is labelled as Statement I and the other is labelled as Statement II :

Statement-I : The first ionization enthalpy of Cr is lower than that of Mn.

Statement-II : The second and third ionization enthalpies of Cr are higher than those of Mn .

In the light of the above statements, choose the correct answer from the options given below :

Option A:
Both Statement-I and Statement-II are false.
Option B:
Statement-I is true but Statement-II is false.
Correct
Option C:
Both Statement-I and Statement-II are true.
Option D:
Statement-I is false but Statement-II is true.

Answer: B

Step-by-step solution

$\mathrm{Cr}=(\mathrm{Ar}) 3 \mathrm{~d}^{5} 4 \mathrm{~s}^{1}$ $\mathrm{Mn}=(\mathrm{Ar}) 3 \mathrm{~d}^{5} 4 \mathrm{~s}^{2}$ $\mathrm{IE}_{1}(\mathrm{Cr})<\mathrm{IE}_{1}(\mathrm{Mn})$ $\mathrm{IE}_{2}(\mathrm{Cr})>\mathrm{IE}_{2}(\mathrm{Mn})$ $\mathrm{IE}_{3}(\mathrm{Cr})<\mathrm{IE}_{3}(\mathrm{Mn})$

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Exam: JEE Main 2026
Paper: 22 January, Evening Shift
Subject: Chemistry
Chapter: d and f Block Elements
Topic: Introduction and Properties of Transition Elements

Among the following oxides of 3d elements, the number of mixed oxides are \ \ \ \ . Ti 2 O 3, V 2 O 4, Cr 2 O 3, Mn 3 O 4, Fe 3 O 4, Fe 2 O…

Answer: B

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