A) Only \[Z{{n}^{2+}}\] is colourless and \[N{{i}^{2+}}\] and \[C{{r}^{3+}}\] are coloured
B) All three are colourless
C) All three are coloured
D) Only \[N{{i}^{2+}}\] is coloured and \[Z{{n}^{2+}}\] and \[C{{r}^{3+}}\] are colourless
Correct Answer: A
Solution :
\[N{{i}^{2+}}\] and \[C{{r}^{2+}}\] are coloured. But \[Z{{n}^{2+}}\] is colourless because of absence of unpaired \[{{e}^{-}}\].
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