Assertion: On moving down the group from N to P there is a considerable increase in covalent radii. On the other hand from As to Bi the increment in covalent radii is very small.
Reason: In heavier elements d and f orbitals are present.

Both Assertion and Reason are true and Reason is the correct explanation for Assertion

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Both Assertion and Reason are true and Reason is NOT the correct explanation for Assertion

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Assertion is true and reason is false

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Both Assertion and Reason are false

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Solution

The correct option is A Both Assertion and Reason are true and Reason is the correct explanation for Assertion
Due to the presence of d and/or f orbitals in heavier elements, the nucleus has tight hold on valence electrons due to poor shielding of d and/or f orbitals. Therefore, the increase in covalent radii is not significant in heavier elements. Thus both Assertion and Reason are true and Reason is the correct explanation for Assertion
Hence option (a) is the correct answer.

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