A borax bead, after touching a salt and heating in the oxidising flame, is violet (amethyst) when cold. The salt contains

Achromium
Bnickel
Cmanganese
Dcobalt

Answer: C

Manganese forms violet manganese(III) metaborate in the oxidising flame. Cobalt gives a blue bead, chromium gives green in both flames and nickel gives a brown bead.

Practice Qualitative Analysis: Anions More on Independent group: sulphate, phosphate, borate

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