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

Iron from haematite

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Aluminium from Cinnabar

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Magnesium from carnallite

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Zinc from zinc blende

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Solution

The correct option is D Iron from haematite
During extraction of Iron, carbon monoxide acts as a principal reducing agent.
The coke is used to produce carbon monoxide as shown below:
$C + O_{2} ⟶ C O_{2}$
$C O_{2} + C ⟶ 2 C O$
$F e_{2} O_{3} + 3 C O ⟶ 2 F e + 3 C O_{2} ↑$

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