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  4. Which of these ions is expected to be coloured in aqueous solution? I. Fe3+ II. Ni2+ III. Al3+

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Q. Which of these ions is expected to be coloured in aqueous solution?
$I. Fe^{3+} $
$II. Ni^{2+} $
$ III. Al^{3+}$

VITEEEVITEEE 2013The d-and f-Block Elements

Solution:

image
$4$ unpaired electrons,
$\therefore $ Coloured ion
image
$2$ unpaired electrons,
$\therefore $ Coloured ion
$III. Al^{3+}=[Ne]$
No unpaired electron in $3d$, thus colourless ion.