Which of the following cations cannot give the borax bead test?

CHEMISTRY · Single correct

Problem

Which of the following cations cannot give the borax bead test? (1)

\mathrm{Cr}^{3+}

(2)

\mathrm{Co}^{2+}

(3)

\mathrm{Ag}^+

(4)

\mathrm{Mn}^{2+}