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

Silica

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Limestone

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Phosphorus chloride

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Calcium phosphate

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Solution

The correct option is B Limestone
Limestone decomposes to give $C a O$ and $C O_{2}$ . The resultant lime ( $C a O$ ) acts as flux, combines with silica (present as impurity - gangue) to form calcium silicate (fusible slag):

$C a C O_{3} \to C a O + C O_{2}$

$C a O + S i O_{2} \to C a S i O_{3}$ slag

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