Which one of the following ions does not give borax bead test :

Options

A. `Cr^(3+)`
B. `Cu^(2+)`
C. `Mn^(2+)`
D. `Zn^(2+)`

Answer

D

Explanation

`Zn^(2+)` is colourless and borax bead test is given by coloured ions such as `Cu^(2+), Mn^(2+), Fe^(3+)` etc.