[Sc{(H_2O)}_6]^{3+} $ ion is [Pb. CET 2004]
A) Colourless and diamagnetic
B) Coloured and octahedral
C) Colourless and diamagnetic
D) Coloured and paramagnetic
Correct Answer: A
$ _{21}Sc=[Ar]\ 3d^{1}4s^{2} $ $ Sc^{3+}=[Ar]\ 3d^{0} $ no unpaired electrons in d sub shell, so it is diamagnetic and colourless.
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