The set having ions which are coloured and paramagnetic both is : - Vidyadip

MCQ

The set having ions which are coloured and paramagnetic both is :

A
$\mathrm{Sc}^{3+}, \mathrm{V}^{5+}, \mathrm{Ti}^{4+}$
✓
$\mathrm{Cu}^{2+}, \mathrm{Cr}^{3+}, \mathrm{Sc}^{+}$
C
$\mathrm{Ni}^{2+}, \mathrm{Mn}^{7+}, \mathrm{Hg}^{2+}$
D
$\mathrm{Cu}^{+}, \mathrm{Zn}^{2+}, \mathrm{Mn}^{4+}$

✓

Answer

Correct option: B.

$\mathrm{Cu}^{2+}, \mathrm{Cr}^{3+}, \mathrm{Sc}^{+}$

b
$\mathrm{Cu}^{2+}:[\mathrm{Ar}] 3 \mathrm{~d}^{9} 4 \mathrm{~s}^{0}$

$\mathrm{Cr}^{3+}:[\mathrm{Ar}] 3 \mathrm{~d}^{3} 4 \mathrm{~s}^{0}$

$\mathrm{Sc}^{+}:[\mathrm{Ar}] 3 \mathrm{~d}^{1} 4 \mathrm{~s}^{1}$

All are coloured and paramagnetic due to presence of unpaired $\mathrm{e}^{-}$

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