NTA Abhyas 2020

Exam: NTA Abhyas
Year: 2020
Subject: Chemistry
Chapter: General Principles and Processes of Isolation of Metals

NTA Abhyas 2020 · Chemistry · General Principles and Processes of Isolation of Metals

Method used for extraction of Pb and Sn from their chief ore

Method used for extraction of

Pb

and

Sn

from their chief ore

Options

ACarbon reduction and self reduction.
BSelf reduction and carbon reduction.
CElectrolysis and self reduction.
DSelf reduction and electrolysis.

Correct answer

B. Self reduction and carbon reduction.

Step-by-step solution

PbO PbS{O}_{4}

get reduced by PbS itself which is already present in mixture so because the reduction took place by mixture itself, hence is known as self reduction.

2PbO + PbS\overset{\Delta}{→}3Pb + S{O}_{2} ↑

PbS{O}_{4} + PbS\overset{\Delta}{→}2Pb + 2S{O}_{2} ↑

While Sn is obtained by carbon reduction from

Sn{O}_{2}

Sn{O}_{2} + 2C\overset{\Delta}{→}Sn + 2CO

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