Question

___ is also known as Cinnabar.

Answer 1

Sulphur is present in many minerals. One of them is the mercuric sulphide. It is commonly called cinnabar. The sulphide ore
burns in the presence of air and sulphur dioxide is obtained as
a byproduct.
$Hg{S}_{}+O_2\to Hg+S{O}_2$
or in words
Mercuric Sulphide + Oxygen $\to$ Mercury + sulphur dioxide