Question

What is cinnabar? How mercury is obtained from cinnabar? Also write its reaction.

Answer 1

Cinnabar (HgS) is the only important ore of Hg. It is concentrated by froth floatation method and mercury is extracted from this ore by heating it in air at 773-873 K (auto reduction).

 

 273-873K

HgS + O2  →  Hg + SO2

 

The mercury vapors thus obtained are condensed to give liquid metal. Hg thus obtained contains impurities of Zn, Sn and Pb. These are removed by treating the impure metal with dil HNO3, mercurous nitrate, Hg2(NO3 )2 thus formed react with metals present as impurities forming their nitrates which pass into solution leaving behind pure mercury. However, it is best purified by distillation under reduced pressure.

 
warm

6Hg + 8HNO3 (dil. )  →  3 Hg ( NO3 )2 + 4H2O + 2NO

Zn + Hg2 ( NO3 )2 → Zn ( NO3 )2 + 2Hg

Answer 2

$\huge\underline\mathfrak\red{Answer}$

Heya friend here's your answer....

Cinnabar also known as HgS is termed as the mercury ore.

Mercury can be obtained from cinnabar by heating the cinnabar ore in a current of air and condensing the mercury vapour formed. Due to its relatively low boiling point mercury can be easily purified by vacuum distillation. The reaction of mercury sulphide with oxygen is shown below:

HgS + O2 = Hg + SO2

This process is also called Roasting. However Mercury can be obtained from other reactions too. For ex:

HgS + Fe = Hg + FeS

4HgS + 3 CaO = 4Hg + 3CaS + CaSO4

Hope this helps...

$\huge\underline\mathfrak\red{Thanks}$