In the manufacture of iron from haemetite, lime stone is added to act as

Flux

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Slag

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A reducing agent

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An oxidising agent

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Solution

The correct option is A Flux
In manufacturing of Iron from Hematite, limestone is added , so that it decompose and form lime (CaO) which 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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