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JEE CHEMISTRY MCQ: CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES

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The set representing the correct order of first ionisation potential is:
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Correct option: B
Be>Mg>Ca\mathrm{Be} > Mg > Ca
Option B (Be>Mg>Ca\mathrm{Be} > Mg > Ca) is correct because ionization potential generally decreases down a group, but Be has a higher ionization energy than expected due to its small size and high effective nuclear charge.

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