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JEE Main 2026 Apr 4 Shift 2, Chemistry Q7: Bohr's Atomic Model

JEE Main2026Apr 4, Shift 2Chemistry
Q.

The 1 ionization enthalpy for Mg is +737 kJ/mol. The most probable estimated value of the 2 ionization enthalpy of Mg is _____.

  1. A

    – 906 kJ/mol

  2. B

    –856 kJ/mol

  3. C

    +1450 kJ/mol

  4. D

    +590 kJ/mol

Solution

Successive ionization enthalpies always increase: removing a second electron from a now-positively-charged ion requires more energy. So kJ/mol.

Furthermore, since IE values are always positive (energy is absorbed), negative options are ruled out. Only +1450 kJ/mol satisfies both conditions.

kJ/mol.

Concept behind this question

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