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JEE CHEMISTRY MCQ: CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES

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The second ionisation enthalpies of elements are always higher than their first ionisation enthalpies because

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Correct option: D

The cation is smaller than its parent atom

Option D (The cation is smaller than its parent atom) is correct because removing an electron increases the effective nuclear charge, causing the remaining electrons to be pulled closer to the nucleus, thus decreasing the size.

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The compounds of the s-block elements, with the exception of lithium and ...

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