In the extraction of iron, which of the following flux is used for the formation of slag:

M g C O_{3}

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Z n C O_{3}

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S i O_{2}

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C a C O_{3}

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Solution

The correct option is A $C a C O_{3}$
In the extraction of iron, the flux used for the formation of slag is $C a C O_{3}$ .
In the zone of slag formation (20 m in height), limestone decomposes to give calcium oxide (quick lime) at about $1200 K$ .
$C a C O_{3} \to C a O + C O_{2}$
Calcium oxide combines with silica and alumina at about 1500 K to form molten slag of calciumsilicate and calcium aluminate.
$C a O + S i O_{2} \to C a S i O_{3}$
$12 C a O + 2 A l_{2} O_{3} \to 4 C a_{3} A l O_{3} + 3 O_{2}$

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{SiO}_{2}

{CaCO}_{3}

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{CaCO}_{3}

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F e O + S i O_{2} \to F e S i O_{3}

S i O_{2} + M g O \to M g O \to M g S i O_{3}

S i O_{2}, M g O, C a O, F e O, B_{2} O_{3}, C a C O_{3}, M g C O_{3}

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