Rinmann's green is a double oxide formed during the cobalt nitrate test for zinc salts. What is the — Qualitative and Quantitative Analysis Chemistry Question
Question
Rinmann's green is a double oxide formed during the cobalt nitrate test for zinc salts. What is the oxidation state of the cobalt atom in the primary compound responsible for the color of Rinmann's green ($ZnO \cdot CoO$)?
Answer: 2
💡 Solution & Explanation
Rinmann's green has the formula $ZnO \cdot CoO$ (or $ZnCo_2O_4$ in some spinel forms, but qualitatively considered $ZnO \cdot CoO$). In $CoO$, the oxidation state of oxygen is -2, meaning the oxidation state of Cobalt ($Co$) is +2.
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