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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

Which reaction does not occur in roasting process.

Which reaction does not occur in roasting process.

Which reaction does not occur in roasting process.

Options

A $HgS + 2HgO\overset{\Delta}{→}3Hg + S{O}_{2}$
B $PbS + 2PbO\overset{\Delta}{→}3Pb + S{O}_{2}$
C $ZnS + 2ZnO\overset{\Delta}{→}3Zn + S{O}_{2}$
DNone of these

Correct answer

C. $ZnS + 2ZnO\overset{\Delta}{→}3Zn + S{O}_{2}$

Step-by-step solution

On roasting

HgS

and

PbS

sulphides ores are partly converted into their respective oxides. Since the oxides of

Hg

and

Pb

are unstable. While that of zinc is stable, therefore, oxides of

Hg

and

Pb

bring about the reduction of their sulphides to metals, but zinc oxides does not reduce

ZnS

to

Zn

metal

Which reaction does not occur in roasting process.

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