Philosopher's wool on treatment with cobalt nitrate produces:

C o B a O_{2}

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C o Z n O_{2}

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C o S r O_{2}

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C o M g O_{2}

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Solution

The correct option is B $C o Z n O_{2}$
The compound zinc oxide ( $Z n O$ ) is called philosopher's wool. When it is heated with cobalt nitrate, Rinmann's green forms as product.

$C o (N O_{3})_{2} \to 2 C o O + 2 N O_{2} + O_{2}$
$C o O + Z n O \to C o Z n O_{2}$

Hence,option B is correct.

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