Question

Philosopher's wool on treatment with cobalt nitrate produce :

• A. CoBaO
• B. CoZnO
• C. CoSrO
• D. CoMgO

Answer 1

Answer: (B)

CoZnO

Answer 2

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