Which one of the following ions is colourless [MP PET 1999; RPET/PMT 1

1.	Which one of the following ions is colourless [MP PET 1999; RPET/PMT 1999]
A.	\[C{{u}^{+}}\]
B.	\[C{{o}^{2+}}\]
C.	\[N{{i}^{2+}}\]
D.	\[F{{e}^{3+}}\]
Answer» B. \[C{{o}^{2+}}\]

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Which one of the following ions is colourless [MP PET 1999; RPET/PMT 1999]

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