####15. Which of the following ions will exhibit colour in aqueous solutions?
[2010]
(a) $La^{3+}(Z=57)$
(b) $Ti^{3+}(Z=22)$
(c) $Lu^{3+}(Z=71)$
(d) $Sc^{3+}(Z=21)$
$To^{3+}: 19 e^{-}=[Ar] 3 d^{1}$ (Colour)
$Lu^{3+}: 68 e^{-}=[Xe] 4 f^{14}$
$Sc^{3+}: 18 e^{-}=[Ar]$
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