When zinc oxide is heated with cobalt nitrate, a green mass is formed due to the formation of a compound which is known as Rinmann’s green. The compound is:

Z n [C o O_{2}]

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C o [Z n O_{2}]

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Z n [C o (N H_{3})_{4}]

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C o [Z n (N H_{3})_{4}]

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Solution

The correct option is B $C o [Z n O_{2}]$
Rinmann's green is $C o [Z n O_{2}]$ .
It is formed by the reaction:
$2 C o (N O_{2})_{3} ⟶ 2 C o O + 4 N O_{2} + O_{2}$
$Z n O + C o O ⟶ C o [Z n O_{2}]$

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