Which gives violet coloured bead in borax bead test

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Which gives violet coloured bead in borax bead test

ChemistryPractical ChemistryJEE Main

Options:

A $\mathrm{Fe}^{2+}$
B $\mathrm{Ni}^{2+}$
C $\mathrm{Co}^{2+}$
D $\mathrm{Mn}^{2+}$

Solution:

1882 Upvotes Verified Answer

The correct answer is: $\mathrm{Mn}^{2+}$

As $\mathrm{Mn}^{2+}$ has all it's electrons (5) unpaired in it's $d$-orbital, so it's extra stable configuration requires high excitation energy and so it gives violet colour.

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