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  4. Philosopher's wool on treatment with cobalt nitrate produce :

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Q. Philosopher's wool on treatment with cobalt nitrate produce :

AFMCAFMC 2002

Solution:

$ZnO$ is philospher's wool. $ZnO$ is an amphoteric oxide. It reacts with $Co \left( NO _{3}\right)_{2}$ as follows
$ZnO + Co \left( NO _{3}\right)_{2} \longrightarrow CoZnO +2 NO _{2} \uparrow+ O _{2} \uparrow$