The flux used in the extraction of iron from haematite in blast furnace, is:

limestone

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silica

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coke

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quartz

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Solution

The correct option is A limestone
The flux used in the extraction of iron from haematite in blast furnace is limestone.

$C a_{3} (P O_{4})_{2}$ present in lime stone reacts with $S i O_{2}$ to produce slag.

Hence, silica impurities are removed by the addition of lime stone.

Option A is correct.

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