In which of the following isolations no reducing agent is required?

Iron from haematite

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Aluminium from bauxite

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Mercury from cinnabar

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Zinc from zinc blende

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Solution

The correct option is C Mercury from cinnabar
In the isolation of Mercury from cinnabar, no reducing agent is required. Mercury is obtained by the self-reduction method.
$H g S + O_{2} Δ - \to H g O + S O_{2}$

$H g O + H g S \to H g + S O_{2}$

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In the extraction of metallic zinc from zinc oxide, the reducing agent used is __.

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