In the cobalt nitrate charcoal cavity test, heating an unknown white powder yields a distinct blue m — Qualitative and Quantitative Analysis Chemistry Question
Question
In the cobalt nitrate charcoal cavity test, heating an unknown white powder yields a distinct blue mass known as Thenard's blue. This indicates the presence of:
Answer: C
💡 Solution & Explanation
Thenard's blue is Cobalt aluminate ($CoO \cdot Al_2O_3$), formed by the reaction of Aluminium oxide with Cobalt oxide. Zinc yields Rinmann's green.
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