Thenard's blue is formed during the charcoal cavity cobalt nitrate test for aluminium salts. It is a — Qualitative and Quantitative Analysis Chemistry Question
Question
Thenard's blue is formed during the charcoal cavity cobalt nitrate test for aluminium salts. It is a double oxide. What is the oxidation state of aluminium in Thenard's blue ($Al_2O_3 \cdot CoO$)?
Answer: 3
💡 Solution & Explanation
Thenard's blue is a mixed oxide with the formula $Al_2O_3 \cdot CoO$ (Cobalt aluminate, $CoAl_2O_4$). In this compound, Cobalt is in the +2 state and Aluminium is in the +3 state, derived from $Al_2O_3$.
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