The correct order of first (Δ i H 1 ) and second (Δ i H 2 ) ionisation enthalpy values of cr and Mn are : A. Δ i H 1 : Cr Mn B. Δ i H 2 : Cr Mn C. Δ i H 1 : Mn Cr D. Δ i H 2 : Mn Cr Choose the correct answer from the options given below :

Chemistry · Periodicity of Elements and Periodic Properties

JEE Main 2026 — 6 April, Evening Shift — Question 54

The correct order of first $\left(\Delta_{\mathrm{i}} \mathrm{H}_{1}\right)$ and second $\left(\Delta_{\mathrm{i}} \mathrm{H}_{2}\right)$ ionisation enthalpy values of cr and Mn are : A. $\Delta_{\mathrm{i}} \mathrm{H}_{1}: \mathrm{Cr}>\mathrm{Mn}$ B. $\Delta_{\mathrm{i}} \mathrm{H}_{2}: \mathrm{Cr}>\mathrm{Mn}$ C. $\Delta_{\mathrm{i}} \mathrm{H}_{1}: \mathrm{Mn}>\mathrm{Cr}$ D. $\Delta_{\mathrm{i}} \mathrm{H}_{2}: \mathrm{Mn}>\mathrm{Cr}$

Choose the correct answer from the options given below :

Option A:
A and B only
Option B:
B and C only
Correct
Option C:
A and D only
Option D:
C and D only

Answer: B

Step-by-step solution

$\quad \mathrm{Cr}-[\mathrm{Ar}] 3 \mathrm{~d}^{5} 4 \mathrm{~s}^{1}$ $\mathrm{Mn}-[\mathrm{Ar}] 3 \mathrm{~d}^{5} 4 \mathrm{~s}^{2}$ $\mathrm{IE}_{1}-\mathrm{Mn}>\mathrm{Cr}$ $\mathrm{IE}_{2}-\mathrm{Mn}<\mathrm{Cr}$

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Exam: JEE Main 2026
Paper: 6 April, Evening Shift
Subject: Chemistry
Chapter: Periodicity of Elements and Periodic Properties
Topic: Periodicity in Chemical Properties (Ionization Energy, Electron Affinity, Electronegativity)

In a period, the first ionisation enthalpy of the element at extreme left and the negative electron gain enthalpy of the extreme right…

Answer: B

Step-by-step solution

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