D-And F-Block Elements Ques 394
Question: Which one of the following ions is colourless
[MP PET 1999; RPET/PMT 1999]
Options:
A) $ C{{u}^{+}} $
B) $ C{{o}^{2+}} $
C) $ N{{i}^{2+}} $
D) $ F{{e}^{3+}} $
Show Answer
Answer:
Correct Answer: A
Solution:
$ C{{u}^{+}}-3d^{10}4s^{0} $ ; no unpaired $ {{e}^{-}} $ .