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  4. The gas evolved in tailing of mercury is

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Q. The gas evolved in tailing of mercury is

Punjab PMETPunjab PMET 2011

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.
$2Hg+O_{3}\rightarrow Hg_{2}O+O_{2}\uparrow$