Published by:
CGP EDU Academic Team
Published on: August 14, 2026
Which of the following statements, about the advantage of roasting of sulphide ore before reduction is not true?
A
The 
of the sulphide is greater than those for 
and 
of the sulphide is greater than those for and
B
The 
is negative for roasting of sulphide ore to oxide.
is negative for roasting of sulphide ore to oxide.
C
Roasting of the sulphide to the oxide is thermodynamically feasible.
D
Carbon and hydrogen are suitable reducing agents for metal sulphides.( 2007 )
Text Solution
Verified by ExpertsThe correct answer is:
D
: The standard free energies of formation ( G ) of most of the sulphides are greater than those of 
and 
. Hence, neither carbon nor hydrogen can reduce metal sulphides to metal. The standard free energies of formation of oxides are much lower than those of 
. Therefore, oxidation of metal sulphides to metal oxides is thermodynamically favourable. Hence sulphide ore is roasted to the oxide before reduction.
Prepare Smarter with CGP Edu
Get practice questions, solutions, and test series in one place.
Write a Review
Share your experience with this question and solution.
Commentary
Send your comment, doubt, correction, or feedback to admin.
Similar Questions
Explore conceptually related problems
Considering Ellingham diagram, which of the following metals can be used to reduce alumina?
Extraction of gold and silver involves leaching with ion. Silver is later recovered by
Match items of Column I with the items of Column II and assign the correct code :
Column I Column II
In the extraction of copper from its sulphide ore, the metal is finally obtained by the reduction o…
“Metals are usually not found as nitrates in their ores.” Out of the following two (I and II) reaso…
Roasting of sulphides gives the gas as a byproduct. This is a colourless gas with choking smell of…