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JEE CHEMISTRY MCQ: CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES

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What is the correct order of ionisation energy
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Correct option: A
B>Al<Ga>In<TlB > Al < Ga > In < Tl
Option D (B>Al<Ga<In<TlB > Al < Ga < In < Tl) is correct because ionization energy generally decreases down a group, but there are exceptions due to the filling of d and f orbitals.

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