Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
JEE Main 20254 AprilEvening Shift
Exam
JEE Main
Year
2025
Date
4 April
Shift
Evening Shift
Subject
Chemistry
Chapter
d and f Block Elements

JEE Main 2025 · 4 April · Evening Shift · Chemistry · d and f Block Elements

The incorrect relationship in the following pairs in relation to...

The incorrect relationship in the following pairs in relation to ionisation enthalpies is :

Options

  1. AMn+<Cr+\mathrm{Mn}^{+} \lt \mathrm{Cr}^{+}
  2. BMn+<Mn2+\mathrm{Mn}^{+} \lt \mathrm{Mn}^{2+}
  3. CFe2+<Fe3+\mathrm{Fe}^{2+} \lt \mathrm{Fe}^{3+}
  4. DMn2+<Fe2+\mathrm{Mn}^{2+} \lt \mathrm{Fe}^{2+}

Correct answer

D. Mn2+<Fe2+\mathrm{Mn}^{2+} \lt \mathrm{Fe}^{2+}

Step-by-step solution

Mn2+:[Ar]3 d5\mathrm{Mn}^{2+}:[\mathrm{Ar}] 3 \mathrm{~d}^5
Half filled stability
More 1 E than Fe2+\mathrm{Fe}^{2+}
Fe2+:[Ar]3 d6\mathrm{Fe}^{2+}:[\mathrm{Ar}] 3 \mathrm{~d}^6
Practice d and f Block Elements on Quantrex Academy →

More from d and f Block Elements

Given below are two statements: Statement I: The number of pairs among [Ti^ 4+ , V^ 2+ ]… JEE Main 2026Given below are two statements for catalytic properties of transition metals. Statement… JEE Main 2026The correct order of first (Δ_i H_1) and second (Δ_i H_2) ionisation enthalpy values of… JEE Main 2026The correct statements among the following are. A. Basic vanadium oxide is used in the… JEE Main 2026Given below are two statements : Statement I: Presence of large number of unpaired… JEE Main 2026A paper dipped in a dil. H_2SO_4 solution of ' X ' upon treatment with SO_2 gas turns… JEE Main 2026Which of the following is NOT a physical or chemical characteristics of interstitial… JEE Main 2026Pairs of elements with the same number of electrons in their respective 4f orbital are… JEE Main 2026 Full d and f Block Elements list All JEE Main PYQs