A white solid forms Rinmann's green in the charcoal cavity test in an oxidising flame. On treatment with dilute H2SO4, this solid produces a gas that turns an acidified dichromate paper green and lead

Question

A white solid forms Rinmann's green in the charcoal cavity test in an oxidising flame. On treatment with dilute H2SO4, this solid produces a gas that turns an acidified dichromate paper green and lead acetate paper black. The white solid is:

Prashant Kotian · Accepted Answer

Correct answer: C. Step 1: Heating a zinc salt with cobalt nitrate on a charcoal block produces a green mass composed of cobalt zincate. Step 2: The chemical formula of this mixed oxide is CoZnO2. Step 3: Rinmann's green is chemically cobalt zincate, CoZnO2, matching option (c).

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