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 gr

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 ($ZnO \cdot CoO$)?

Prashant Kotian · Accepted Answer

Correct answer: 2. Rinmann's green has the formula (or in some spinel forms, but qualitatively considered ). In , the oxidation state of oxygen is -2, meaning the oxidation state of Cobalt () is +2.

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