Metals low in activity
series can be obtained by reducing their sulphides or oxides by heating.
Mercury is the only metal that exists as liquid at room temperature. It can be
obtained by heating cinnabar (HgS), the sulphide ore of mercury. The reactions
are as follows:
3O2(g) 2HgO(s) + 2SO2(g)
2Hg(l) + O2(g)
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