In the extraction of copper from its sulphide ore, the metal is finally obtained by the reduction of cuprous oxide with
Copper (I) sulphide (Cu2S)
sulphur dioxide (SO2)
Iron sulphide (FeS)
Iron sulphide (FeS)
A.
Copper (I) sulphide (Cu2S)
In the extraction of copper from its sulphide ore, when ore is subjected to roasting, some of it is oxidised to Cu2O which reacts with the remaining Cu2S (sulphide ore) to give copper metal.
Cu2S +2Cu2O → 6Cu +SO2 ↑
In this process, Cu2S behaves as reducing agent.
Which of the following elements is present as the impurity to the maximum extent in the big iron?
Carbon
Silicon
Phosphorus
Phosphorus
A.
Carbon
Pig iron contains about 4% carbon (major impurity) and other impurities (S, P, Si, Mn) in trace amount.
Identify the alloy containing a non-metal as a constituent in it.
Invar
Steel
Bell metal
Bell metal
B.
Steel
|
Alloy |
Constituents |
|
Invar |
Fe + Ni |
|
Steel |
Fe + C |
|
Bell metal |
Cu (80%) +Sn (20%) |
|
Bronze |
Cu (75,90%) +Sn (10.25%) |
In the extraction of copper from its sulphide ore, the metal finally obtained by the reduction of cuprous oxide with
Iron (II) sulphide
Carbon monoxide
Copper (I) sulphide
Copper (I) sulphide
C.
Copper (I) sulphide
Reduction of Copper oxide done with Copper (I) sulphide.
Cu2S + 2Cu2O → 6Cu +SO2 ↑
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