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

Silica

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Quick lime

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Phosphorus chloride

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Calcium phosphate

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Solution

The correct option is B Quick lime
Lime stone decomposes to give $C a O and C O_{2}$ . The resultant lime $(C a O)$ act as flux, combines with silica (present as impurity-gangue) to form calcium silicate (fusible slag) :
$C a C O_{3} \to C a O + C O_{2}$
$C a O + S i O_{2} \to C a S i O_{3} S l a g$ .

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