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A sample of ore containing $P b S O_{4}$ and silica is to be refined to extract $P b$ metal via calcination followed by roasting. The changes that occur

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If a little lime stone is added during calcination $P b O$ is formed easily and prevents the formation of lead silicate

During calcinations $P b S O_{4}$ converts into $P b O$ liberting $S O_{2}$ gas

The slag formed is $C a S i O_{3}$

The coke used to provide heat for calcinations provide a reducing atmosphere leading to the formation of lead.

answer is A, B, C, D.

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Detailed Solution

$P b S O_{4} \to P b O + S O_{3}$

$P b O + C O \to P b + C O_{2}$

$P b O + S i O_{2} \to P b S i O_{3}$

$P b O + C a C O_{3} \to P b S i O_{3} + C a O$

$P b C O_{3} \to P b O + C O_{2}$

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

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