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  4. Chloride of which of the following element is colored?

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Q. Chloride of which of the following element is colored?

ManipalManipal 2011The d-and f-Block Elements

Solution:

In $CoCl _{3},\, Co$ is in $+3$ state
$Co ^{3+}=1 s^{2},\, 2 s^{2} 2 p^{6},\, 3 s^{2} 3 p^{6} 3 d^{6},\, 4 s^{\circ}$
4 unpaired electrons, so it will be coloured.