A) HgO
B) ZnO
C) CaO
D) \[A{{l}_{2}}{{O}_{3}}\]
Correct Answer: A
Solution :
Oxides of less electropositive metals (like HgO) on moderate heating gives off \[{{O}_{2}}\]. \[2HgO\xrightarrow{High\,\,\,temperature}2Hg+{{O}_{2}}\]
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