P-Block Elements Ques 233
Question: Which of the following is not known
[MP PET/PMT 1988; NCERT 1982; CBSE PMT 1989; MP PET 1993]
Options:
A) $ NCl_5 $
B) $ NI_3 $
C) $ SbCl_3 $
D) $ NCl_3 $
Show Answer
Answer:
Correct Answer: A
Solution:
$ NCl_5 $ is not known because of absence of d-orbitals in nitrogen.