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JEE CHEMISTRY MCQ: CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES

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Which of the following process requires largest amount of energy

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Correct option: B

Al_{(g)}^{2 + } \to Al_{(g)}^{3 + } + {e^ - }

Option B (

Al_{(g)}^{2 + } \to Al_{(g)}^{3 + } + {e^ - }

) is correct because removing an electron from a 2+ ion requires more energy than from a neutral atom or a 1+ ion due to increased effective nuclear charge.

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