A) \[C{{O}_{2}}\]
B) \[{{O}_{2}}\]
C) \[S{{O}_{2}}\]
D) \[{{H}_{2}}\]
Correct Answer: B
Solution :
Mercury in presence of ozone, oxydised to suboxide. It loses its meniscus and it is termed as tailing of mercury. The gas evolved is oxygen. \[2Hg+{{O}_{3}}\xrightarrow{{}}H{{g}_{2}}O+{{O}_{2}}\uparrow \]
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