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Metallurgy — Chemistry STD 12 — Question

Tamilnadu BoardEnglish MediumSTD 12ChemistryMetallurgy2 Marks
Question
Explain Auto reduction.
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Answer

Simple roasting of some of the ores give the crude metal. In such cases, the use of reducing agents is not necessary. For example, mercury is obtained by roasting of its ore cinnabar (Hgs)
$HgS _{( s )}+ O _{2( g )} \rightarrow Hg _{( l )}+ SO _2 \uparrow$

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