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JEE CHEMISTRY MCQ: CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES

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Understanding +4 | -1

Assertion (A):

\mathrm{Na}^{+}

and

\mathrm{Al}^{3+}

are isoelectronic but the ionic radii of

\mathrm{Al}^{3+}

is smaller than

\mathrm{Na}^{+}

Reason (R): The nuclear attraction on the outermost shell electrons of

\mathrm{Al}^{3+}

is greater than that of

\mathrm{Na}^{+}

View answer and explanation

Correct option: A

Both Assertion and Reason are correct; Reason is the correct explanation of Assertion

Option A (Both Assertion and Reason are correct; Reason is the correct explanation of Assertion) is correct because both ions are isoelectronic, and the higher nuclear charge of Al³⁺ results in a smaller ionic radius.

JEE CHEMISTRY MCQ: CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES

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