Assertion :SiO $_{2}$ used to remove impurities of CaO in an ore. Reason: CaO is infusible mass of basic nature. It reacts with flux SiO $_{2}$ (acidic in nature) to give fusible mass of CaSiO $_{3}$ .

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
In the metallurgy of iron, limestone (CaCO $_{3}$ ) acts as a flux and forms calcium silicate CaSiO $_{3}$ (slag).

$C a C O_{3} \to C a O + C O_{2} ↑$

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

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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

{SiO}_{2}

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