In which of the following isolation, reducing agent is not required.

Iron from haematite

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Aluminium from bauxite

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Mercury from cinnnabar

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Zinc from zinc blende

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Solution

The correct option is C Mercury from cinnnabar
In the isolation of mercury from cinnabbar, no reducing agent is required because mercury is obtained by auto reduction or self reduction.
$2 H g S + 3 O_{2} Δ ⟶ 2 H g O + 2 S O_{2} 2 H g O + H g S \to 2 H g + S O_{2}$

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