A) CoBaO
B) CoZnO
C) CoSrO
D) CoMgO
Correct Answer: B
Solution :
ZnO is philospher's wool. ZnO is an amphoteric oxide. It reacts with \[Co{{(N{{O}_{3}})}_{2}}\]as follows \[ZnO+Co{{(N{{O}_{3}})}_{2}}\xrightarrow{{}}CoZnO+2N{{O}_{2}}\uparrow +\,\,{{O}_{2}}\uparrow \]
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