Limestone is added in the extraction of lead from galena why?

It remove the impurity of silica as fusible slag

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All of the above

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It converts lead silicate to lead oxide

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It prevents the formation of

P b S O_{4}

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Solution

The correct option is D It prevents the formation of $P b S O_{4}$
The process of limestone is,
$C a O + S i O_{2} \to C a S i O_{3}$
$P b O + S i O_{2} \to P b S i O_{3}$
$P b S i O_{3} + C a O \to P b O + C a S i O_{3}$

$C a O$ converts $P b S i O_{3}$ to $P b O$ and also prevent the formation of $P b S O_{4}$ .

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