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Q.

(A) Pentahalides of phosphorus are known but not those of nitrogen.
(R) Phosphorus has low electronegativity than nitrogen.
 

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a

[A] is correct and [R] is correct explanation of [A]

b

[A] is correct and [R] is not correct explanation of [A]

c

[A] is correct and [R] is incorrect

d

Both [A] & [R] are incorrect

answer is B.

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Detailed Solution

Nitrogen do not from pentahalides due to non-availability of vacant d-orbitals. 

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