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Chemistry · d and f Block Elements

JEE Main 2025 — 4 April, Evening Shift — Question 1

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

  1. Option A:

    Mn+<Mn2+\mathrm{Mn}^{+}<\mathrm{Mn}^{2+}

  2. Option B:

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

    Correct
  3. Option C:

    Mn+<Cr+\mathrm{Mn}^{+}<\mathrm{Cr}^{+}

  4. Option D:

    Fe2+<Fe3+\mathrm{Fe}^{2+}<\mathrm{Fe}^{3+}

Answer: B

Step-by-step solution

I.E. of Mn2+:3260 kJ/mol\mathrm{Mn}^{2+}: 3260 \mathrm{~kJ} / \mathrm{mol}

I.E. of Fe2+\mathrm{Fe}^{2+} : 2962 kJ/mol2962 \mathrm{~kJ} / \mathrm{mol}

Successive IE always increases

Answer key and solution verified before publishing.

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

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