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Q.

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.
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