JIPMER 2018

Exam: JIPMER
Year: 2018
Subject: Chemistry
Chapter: General Principles and Processes of Isolation of Metals

JIPMER 2018 · Chemistry · General Principles and Processes of Isolation of Metals

Lead is extracted from galena (PbS) , either by following ways....

Lead is extracted from galena

(\mathrm{PbS})

, either by following ways. Lead is extracted from galena (PbS) , either by following ways. Auto-reduction process is

Auto-reduction process is

Options

AI
BII
CBoth (a) and (b)
DNone of these

Correct answer

B. II

Step-by-step solution

In auto-reduction, no external reducing agent is required. In such reduction reaction, the product formed acts as a reducing agent and reduces the oxide to metal. Thus, only reaction II is called auto-reduction.

\begin{aligned} & 2 \mathrm{PbS}+3 \mathrm{O}_2 \xrightarrow{\text{ Roasted in air }} 2 \mathrm{PbO}+2 \mathrm{SO}_2 \\ & 2 \mathrm{PbO}+\mathrm{PbS} \longrightarrow 3 \mathrm{~Pb}+\mathrm{SO}_2 \\ &\begin{array}{l}\text{ (Act as a } \\ \text{ reducing agent) }\end{array}\end{aligned}

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