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Question

Assertion :Na+ and Al3+ are isoelectronic but the magnitude of ionic radius of Al3+ is less than that of Na+. Reason: The magnitude of effective nuclear charge of the outershell electrons in Al3+ is greater than that in Na+.

A
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
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B
Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
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C
Assertion is correct but Reason is incorrect
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D
Assertion is incorrect but Reason is correct
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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
The magnitude of effective nuclear charge of the outershell electrons in Al3+ is greater than that in Na+.
Thus, Na+ and Al3+ are isoelectronic but the magnitude of ionic radius of Al3+ is less than that of Na+.
Thus, both Assertion and Reason are correct and Reason is the correct explanation for Assertion.

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