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  4. Which one of the following ionic species will impart colour to an aqueous solution ?

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Q. Which one of the following ionic species will impart colour to an aqueous solution ?

AIPMTAIPMT 1998The d-and f-Block Elements

Solution:

$Cr ^{3+}=1 s^{2}, 2 s^{2} 2 p^{6}, 3 s^{2} 3 p^{6} 3 d^{3}$ (coloured)
$\left( Cr ^{3+}\right.$ contains 3 unpaired $e^{-}$, so it gives colour)
$Zn ^{2+}=1 s^{2}, 2 s^{2} 2 p^{6}, 3 s^{2} 3 p^{6} 3 d^{10}$ (colourless)
$Cu ^{+}=1 s^{2}, 2 s^{2} 2 p^{6}, 3 s^{2} 3 p^{6} 3 d^{10}$ (colourless)
$Ti ^{4+}=1 s^{2}, 2 s^{2} 2 p^{6}, 3 s^{2} 3 p^{6}$ (colourless)
(Colour is produced due to presence of unpaired electrons.)