Which of the following cations will turn a borax bead green in an oxidising flame?

CHEMISTRY · Single correct · CBSE · Chemistry · d- and f-Block Elements · d- and f-Block Elements

Problem

Which of the following cations will turn a borax bead green in an oxidising flame? (1)

\text{Fe}^{2+}

(2)

\text{Mn}^{2+}

(3)

\text{Cr}^{3+}

(4)

\text{Cu}^{2+}