Which of the following is not correct w.r.t. elements of 15th, group of periodic table?
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a
Only nitrogen occurs in gaseous state
b
Except nitrogen all are tetratomic molecules
c
Except nitrogen all form MCl5 chlorides
d
Electron affinity of nitrogen is taken as zero
answer is C.
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Detailed Solution
Nitrogen atom does not have d-subshell in its valence shell. It cannot expand. Its V.S. electronic configuration (2s2 2p3) and. hence, cannot form NCl5.