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JIPMER 2016

Exam: JIPMER
Year: 2016
Subject: Chemistry
Chapter: General Principles and Processes of Isolation of Metals

JIPMER 2016 · Chemistry · General Principles and Processes of Isolation of Metals

Lime stone is added in the extraction of lead from galena why?

Lime stone is added in the extraction of lead from galena why?

Options

AIt prevents the formation of $\mathrm{PbSO}_4$
BIt remove the impurity of silica as fusible slag
CIt converts lead silicate to lead oxide
DAll of the above

Correct answer

D. All of the above

Step-by-step solution

\begin{aligned} & \mathrm{CaO}+\mathrm{SiO}_2 \longrightarrow \mathrm{CaSiO}_3 \text{ (Slag) } \\ & \mathrm{PbO}+\mathrm{SiO}_2 \longrightarrow \mathrm{PbSiO}_3 \\ & \mathrm{CaO} \text{ converts } \mathrm{PbSiO}_3 \text{ to } \mathrm{PbO}, \\ & \mathrm{PbSiO}_3+\mathrm{CaO} \longrightarrow \mathrm{PbO}+\mathrm{CaSiO}_3\end{aligned}

and also prevents the formation of

\mathrm{PbSO}_4

.

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