A transition metal cation forms a characteristic deep blue bead in BOTH the oxidising and reducing f — Qualitative and Quantitative Analysis Chemistry Question
Question
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:
Answer: B
💡 Solution & Explanation
Cobalt salts form cobalt metaborate ($Co(BO_2)_2$) 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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