Q.

Maximum covalency of Nitrogen is -------and in Phosphorous,Arsenic , Antimony, Bismuth is----------

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a

6,6

b

4,4

c

4,6

d

3,6

answer is C.

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Detailed Solution

Due to non-availability of d-orbitals in 'N' , Nitrogen can not expand octect.Its maximum covalency is 4 (only 2s,2p orbitals are available)In all other elements of 15th group maximum covalency is six due to the availability of vacant d-orbitals.
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