A borax bead tinted with an unknown metal salt is yellow (cold) in the oxidising flame and bottle-green in the reducing flame. The metal is:

Answer: C

Iron gives a yellow-brown bead in the oxidising flame (ferric borate) and a bottle-green bead in the reducing flame (ferrous borate). Chromium is green in both flames, cobalt blue in both, and nickel brown (oxidising) or grey (reducing).

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