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Chemistry · Periodicity of Elements and Periodic Properties

JEE Main 2026 — 4 April, Evening Shift — Question 54

The 1st 1^{\text {st }} ionization enthalpy for Mg is +737 kJ/mol+737 \mathrm{~kJ} / \mathrm{mol}. The most probable estimated value of the 2nd 2^{\text {nd }} ionization enthalpy of Mg is ____\_\_\_\_ .

  1. Option A:

    −906 kJ/mol-906 \mathrm{~kJ} / \mathrm{mol}

  2. Option B:

    −856 kJ/mol-856 \mathrm{~kJ} / \mathrm{mol}

  3. Option C:

    +1450 kJ/mol+1450 \mathrm{~kJ} / \mathrm{mol}

    Correct
  4. Option D:

    +590 kJ/mol+590 \mathrm{~kJ} / \mathrm{mol}

Answer: C

Step-by-step solution

Since successive ionization energy increases thus IE2(Mg)>IE1(Mg)\mathrm{IE}_{2}(\mathrm{Mg})>\mathrm{IE}_{1}(\mathrm{Mg})

Answer key and solution verified before publishing.

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Exam
JEE Main 2026
Paper
4 April, Evening Shift
Subject
Chemistry
Chapter
Periodicity of Elements and Periodic Properties
Topic
Periodicity in Chemical Properties (Ionization Energy, Electron Affinity, Electronegativity)
The 1 st ionization enthalpy for Mg is +737 kJ / mol . The most… | JEE Main 2026 PYQ with Solution · DhiX AI