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Chemistry · Periodicity of Elements and Periodic Properties

JEE Main 2026 — 2 April, Evening Shift — Question 62

Among Fe2+,Fe3+,Cr2+\mathrm{Fe}^{2+}, \mathrm{Fe}^{3+}, \mathrm{Cr}^{2+} and Zn2+\mathrm{Zn}^{2+}, the ion that shows positive borax bead test and with highest ionisation enthalpy is:

  1. Option A:

    Fe2+\mathrm{Fe}^{2+}

  2. Option B:

    Zn2+\mathrm{Zn}^{2+}

  3. Option C:

    Cr2+\mathrm{Cr}^{2+}

  4. Option D:

    Fe3+\mathrm{Fe}^{3+}

    Correct

Answer: D

Step-by-step solution

Zn2+\mathrm{Zn}^{2+} does not show Borax Bead Test. Among remaining ions; Fe3+\mathrm{Fe}^{3+} has maximum ionization energy.

Answer key and solution verified before publishing.

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

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