Impurities of sulphur, silicon, and phosphorus can be removed from cast iron by adding:

carbon which reduces the impurities

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water which dissolves the impurities

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limestone which changes impurities into oxides and pass into slag

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iron oxide which reacts with impurities by forming slag

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Solution

The correct option is C limestone which changes impurities into oxides and pass into slag
Flux is added to remove impurities as slag. So impurities like Sulphur, Silicon and Phosphorous are removed from case Iron by adding flux. Here flux is $C a C O_{3}$

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Similar questions

Assertion – The non-fusible impurities present in iron ore are removed by $C a C O_{3}$ .

Reason: $C a C O_{3}$ which decomposes into $C a O$ and $C O_{2}$ . The $C a O$ formed reacts with $S i O_{2}$ to remove silica

C

C O

{SiO}_{2}

{CaCO}_{3}

CaO

{CaCO}_{3}

{SiO}_{2}

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