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AUTO REDUCTION...

AUTO REDUCTION

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(i) Simple roasting of some of the ores give the crude metal. In such cases, the use of reducing agents is not necessary.
(ii) For example, mercury is obtained by roasting of its ore cinnabar (HgS)
`HgS_((s)) + O_(2(g)) rarr Hg_((l)) + SO_(2) uarr`
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