Which gas evolved in tailing of mercury?

Answer 1

when Mercury is reacted with ozone it loses its meniscus and sticks to the surface of the glass. This is basically due to the formation of mercurous oxide.

Hg + O3 GIVES Hg2O + O2

OXYGEN GAS IS LIBERATED

This can be removed by washing it with water, as it is soluble in water

Answer 2

The gas evolved in the tailings of mercury is primarily mercury vapor, which can be released into the environment during mining and processing activities. Mercury vapor can be toxic and poses a risk to both human health and the environment if not properly managed.