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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

Pb and Sn are extracted from their chief ore& respectively by&

\text{Pb}

and

\text{S}\text{n}

are extracted from their chief ore& respectively by&

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

\text{PbO}

and

{\text{PbSO}_{4}

get reduced by

\text{PbS}

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

\text{2PbO+PbS}\overset{Δ}{→} {\text{3Pb+SO}_{2}↑

\text{P}\text{b}\text{S}{O}_{4} + \text{P}\text{b}\text{S}\mathop{→}_{}^{Δ} 2\text{P}\text{b} + 2\text{S}{O}_{2} ↑

{SnO}_{2} + \text{C} \to \text{Sn} + {CO}_{2}

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