Question

Which metal salt gives a green coloured bead in the sodium carbonate bead test?

• A. $M{n}^{2+}$
• B. $C{o}^{2+}$
• C. $N{i}^{2+}$
• D. $F{e}^{2+}$

Answer 1

The correct option is A $M{n}^{2+}$

Oxides of manganese fuse with microcosmic salt in the oxidation flame, to a clear brownish-violet bead, which appears reddish-violet while cooling. This bead does not become opaque when overcharged with manganese.
The oxides of manganese fuse with carbonate of soda upon platinum foil or wire, to a clear green bead, which appears bluish-green and partially opaque when cold.
$MnO+4N{a}_{2}C{O}_3+3O_2\to N{a}_{2}Mn{O}_4+4C{O}_2$