The set having ions

Question:

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

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

  2. $\mathrm{Cu}^{2+}, \mathrm{Zn}^{2+}, \mathrm{Mn}^{4+}$

  3. $\mathrm{Sc}^{3+}, \mathrm{V}^{5+}, \mathrm{Ti}^{4+}$

  4. $\mathrm{Ni}^{2+}, \mathrm{Mn}^{7+}, \mathrm{Hg}^{2+}$

Correct Option: 1

Solution:

$\left.\begin{array}{l}\mathrm{Cu}^{2+}:[\mathrm{Ar}] 3 \mathrm{~d}^{9} 4 \mathrm{~s}^{0} \\ \mathrm{Cr}^{3+}:[\mathrm{Ar}] 3 \mathrm{~d}^{3} 4 \mathrm{~s}^{0} \\ \mathrm{Sc}^{+}:[\mathrm{Ar}] 3 \mathrm{~d}^{1} 4 \mathrm{~s}^{1}\end{array}\right] \begin{aligned}&\text { All are coloured and } \\&\text { paramagnetic due to } \\&\text { presence of unpaired electrons }\end{aligned}$

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