A green pigment is obtained when zinc oxide is heated with cobalt nitrate. This pigment is called the Rinmann’s green. Rinmann’s green is given by?

C o Z n O_{2}

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C o Z n O_{3}

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C o O . Z n O_{2}

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CoO.ZnO

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Solution

The correct option is D CoO.ZnO
The very first thing that should come to your mind is that zinc oxide is heated with cobalt nitrate. What will be the product? If this question strikes your mind then you are on the right track.
Now, cobalt nitrate on heating decomposes as below:
$2 C o (N O_{3})_{2} \to 2 C o O + 4 N O_{2} + O_{2}$

This cobalt oxide which formed on decomposition of cobalt nitrate combines with zinc oxide to give Rinmann’s green.
$C o O + Z n O \to C o Z n O_{2}$ or $C o O . Z n O$

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