Single Choice

Choose the correct answer from the alternative given. Amongst $$TiF_6^{2-}$$, $$CoF$$, $$Cu_2$$ $$Cl_2$$ and $$NiCl$$, which are the colourless species? (atomic number of Ti = 22, Co = 27, Cu = 29, Ni = 28)

A$$CoF_6^{3-}$$and $$NiCl_4^{2-}$$
B`$$TiF_6^{2-}$$and $$Cu_2Cl_2$$
Correct Answer
C$$Cu_2Cl_2$$ and $$NiCl_4^{2-}$$
D$$TiF_6^{2-}$$ and $$CoF_6^{ 3-}$$

Solution

TiF$$_6^{2-}$$ -
The oxidation state of Ti is +4.
Electronic configuration of Ti$$^{4+}$$ is [Ar] 3d$$^0 4s^0$$.
So, unpaired e$$^-$$ s is present in d-orbitals so it is colourless.
Cu$$_2Cl_2$$-
The oxidation state of Cu is +1.
Electronic configuration of Cu$$^+$$ is [Ar] 3d$$^{10} 4s^0$$.
So, no unpaired d e$$^-$$ s are present . Hence, the given compound is colourless.

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