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Question

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

A
Iron from haematite
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B
Aluminium from bauxite
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C
Mercury from cinnnabar
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D
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.
2HgS+3O2Δ2HgO+2SO22HgO+HgS2Hg+SO2

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