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Chemistry · Periodicity of Elements and Periodic Properties

JEE Main 2025 — 22 January, Morning Shift — Question 29

Which of the following electronegativity order is incorrect?

  1. Option A:

    Al<Mg<B<N\mathrm{Al}<\mathrm{Mg}<\mathrm{B}<\mathrm{N}

    Correct
  2. Option B:

    Al<Si<C<N\mathrm{Al}<\mathrm{Si}<\mathrm{C}<\mathrm{N}

  3. Option C:

    Mg<Be<B<N\mathrm{Mg}<\mathrm{Be}<\mathrm{B}<\mathrm{N}

  4. Option D:

    S<Cl<O<\mathrm{S}<\mathrm{Cl}<\mathrm{O}< F

Answer: A

Step-by-step solution

Electronegativity increases across a period and decreases down a group.

In period 3, we have Mg<Al\mathrm{Mg < Al}

Hence option (A) which states Al<Mg\mathrm{Al < Mg} is incorrect.

All other orders follow proper periodic trend.

Therefore, the incorrect order is option A.

Answer key and solution verified before publishing.

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Exam
JEE Main 2025
Paper
22 January, Morning Shift
Subject
Chemistry
Chapter
Periodicity of Elements and Periodic Properties
Topic
Periodicity in Chemical Properties (Ionization Energy, Electron Affinity, Electronegativity)

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Which of the following electronegativity order is incorrect? | JEE Main 2025 PYQ with Solution · DhiX AI