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Question

Zinc on being tested with cobalt nitrate solution gives green colour residue with chemical composition of :

A
ZnO.CoO
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B
ZnCoO + Nitrogen dioxide
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C
ZnO + Nitrogen dioxide
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D
none of the above
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Solution

The correct option is A ZnO.CoO
In cobalt nitrate test a drop of cobalt nitrate solution is added in the residue left in charcoal cavity, it is heated in an oxidizing flame and the color of residue suggests cation. Zinc on being tested with cobalt nitrate solution gives green colour residue with chemical composition of ZnO.CoO

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