Question

The above process is:

$HgS\stackrel{O_2}{\to }HgS.HgO$

$\downarrow \Delta$

$Hg$

• A. auto oxidation
• B. self reduction
• C. thermal reduction
• D. none of the above

Answer 1

The correct option is B self reduction

Cinnabar ($HgS$), when heated with a current of $O_2$ gets reduced to $Hg$ without the need of any additional reducing agent. The process involved is known as self reduction