Select all correct statements about borax bead tests (colours stated for the cold bead).

AA manganese salt gives a colourless bead in the reducing flame.
BA cobalt salt gives a deep blue bead in both flames.
CA chromium salt gives a green bead in the oxidising flame but a colourless bead in the reducing flame.
DA copper(II) salt gives a blue bead in the oxidising flame.

Answer: A, B, D

Copper gives blue (

Cu (BO X_{2}) X_{2}

) and cobalt blue in both flames; manganese(III) metaborate is reduced to nearly colourless manganese(II) metaborate. Chromium is green in both flames, so the last statement is false.

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