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Explanation of mercury ore?

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Explanation of mercury ore?

Posted by Shubham Kushwaha 6 years, 4 months ago

CBSE > Class 10 > Science

2 answers

Yogita Ingle 6 years, 4 months ago

Main ore of mercury is cinnarbar, HgS.

The extraction of mercury from cinnabar ore involves two steps:

1. The concentrated mercury (II) sulphide ore is roasted in air to form mercuric oxide (HgO).

2. This Mercuric oxide formed is then reduced to mercury on further heating to about 300^oC.
2HgS(s) + 3O2(g) $\;\xrightarrow\triangle$ 2HgO(s) + 2SO2(g)
2HgO (s) $\;\xrightarrow\triangle$ 2Hg(l) + O2 (g)

Anushka Jugran ? 6 years, 4 months ago

Mercury belongs to least reactivity series. It have a sulphide ore called cinnabar. (HgS). Cinnabar is first heated in air. Which turns HgS into HgO with liberation of So2. Mercury oxide so obtained is again heated strongly . this reduces Mercury oxide to Mercury metal. HgS+O2 gives HgO+So2... THEN, HgO gives Hg+O2.

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