Assertion :- There is considerable increase in covalent radius from N to P. How ever from As to $B i$ only a small increase in covalent radius is observed.
Reason:- Covalent and Ionic radii in a particular oxidation state increased down the group.

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(A) is correct but (R) is incorrect

Both (A) and (R) are correct, but (R) is not the correct explanation of (A)

Both (A) and (R) are correct but (R) is the correct explanation of (A)

(A) is incorrect but (R) is correct

answer is A.

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Detailed Solution

Covalent and ionic (in a particular state) radii increase in size down the group. There is a considerable increase in covalent radius from N to P. However, from As to Bi only a small increase in covalent radii(lanthanoid contraction) is observed. This is due to the presence of completely filled d and f-orbitals in heavier elements.

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