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}^{-}} $ .



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