Which metal salt gives a violet coloured bead in the borax bead test ?

Options

A. `Fe^(2+)`
B. `Ni^(+2)`
C. `Co^(2+)`
D. `Mn^(2+)`

Answer

C

Explanation

As `Mn^(+2)` has all its electrons (5) unpaired in its d–orbital, so its extra stable configuration requires high excitation energy and so it gives violet colour.