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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?

NTA AbhyasNTA Abhyas 2022

Solution:

Here $Cr^{3 +}$ is coloured while rest other ions are coloureless.
$Ti^{4 +}=\left[\right.Ar\left]\right.4s^{0}3d^{0}$ (0 unpaired $e^{-}$ )
$Cu^{+}=\left[\right.Ar\left]\right.4s^{0}3d^{10}$ (0 unpaired $e^{-}$ )
$Zn^{2 +}=\left[\right.Ar\left]\right.4s^{0}3d^{10}$ (0 unpaired $e^{-}$ )
$Cr^{3 +}=\left[\right.Ar\left]\right.4s^{0}3d^{3}$ (3 unpaired $e^{-}$ )