A transition metal cation forms a characteristic deep blue bead in BOTH the oxidising and reducing flames in the borax bead test (hot and cold). The metal is:

Question

Prashant Kotian · Accepted Answer

Correct answer: B. Cobalt salts form cobalt metaborate () upon reacting with boric anhydride, which exhibits a reliable deep blue colour in both oxidising and reducing flames, hot and cold.

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