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 ()?

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 ($Al_2O_3 \cdot CoO$)?

Prashant Kotian · Accepted Answer

Correct answer: 3. Thenard's blue is a mixed oxide with the formula (Cobalt aluminate, ). In this compound, Cobalt is in the +2 state and Aluminium is in the +3 state, derived from .

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