Extraction of Copper
Trending Questions
Q. 32. The amount of zinc required to produce 224 ml of H2 at STP on treatment with dilute H2SO4 will be what?
Q.
Which of the following is not an ore of copper?
Azurite
Karnallite
Chalcopyrite
Covellite
Q. Which of the following statements is incorrect about the extractive metallurgy of copper?
- Matte formed after smelting chiefly consists of cuprous sulfide and a bit of ferrous sulfide.
- Most of the SiO2 impurity is removed as fusible slag during roasting which combines with flux FeO.
- The copper pyrites are concentrated by the froth floatation process.
- FeS as an impurity is roasted to FeO which reacts with flux SiO2 to form slag FeSiO3 in the blast furnace during smelting and in a Bessemer Converter during self reduction.
Q. The chemical composition of 'slag' formed during the smelting process in the extraction of copper is:
- Cu2S+FeO
- Cu2O+FeS
- FeSiO3
- CuFeS2
Q.
With respect to the reduction of iron ore in the blast furnace, answer the following questions:
Name the raw material placed in the blast furnace.
Q.
Which of the following is not a process involved in the extraction of copper?
Self-reduction
Carbon reduction
Smelting
Roasting
Q.
Malachite Is an Ore Of
Iron
Zinc
Copper
Silver
Q. what is the z-effective of 4s and 3d e^- of zinc
Q. the work done in a open vessel at 300K, when 56g iron reacts with dilute HCl is?
Q. Copper is purified by electrolytic refining of blister copper. The correct statement(s) about this process is (are):
- Impure Cu strip is used as cathode
- Acidified aqueous CuSO4 is used as electrolyte
- Pure Cu deposits at cathode
- Impurities settle as anode-mud
Q. What is the chemical composition of 'slag' formed during smelting in the extraction of copper?
- Cu2SiO3
- FeSiO3
- CuFeS2
- CuSiO3
Q. For a given reaction, ΔH = – 40.7 kJ mol–1 and ΔS = 74.2 JK–1 mol–1. The reaction is spontaneous
Options:
Only below 548.5 K
Only above 548.5 K
At 548.5 K only
At all temperature
Q. In the extraction of copper from its sulphide ore, the metal is formed by the reduction of Cu2O with:
- CO
- SO2
- FeS
- Cu2S
Q. Although there are several ores, 80% of the world copper production comes from the ore chalcopyrite (CuFeS2). The extraction of copper from chalcopyrite involves partial roasting, removal of iron and self-reduction. In the self-reduction step, the reducing species is:
- S
- O2−
- S2−
- SO2
Q. Which of the following does not evolve oxygen at anode when electroysis is carried?
Given:
E0Cu/Cu2+=−0.34 V
E0H2O/O2=−1.23 V
Given:
E0Cu/Cu2+=−0.34 V
E0H2O/O2=−1.23 V
- dil.H2SO4 with Pt electrode
- dil.H2SO4 with Cu electrode
- Acidic water with Pt electrode
- Fused NaOH with Pt electrode
Q. Which of the following does not evolve oxygen at anode when electroysis is carried?
Given:
E0Cu/Cu2+=−0.34 V
E0H2O/O2=−1.23 V
Given:
E0Cu/Cu2+=−0.34 V
E0H2O/O2=−1.23 V
- Acidic water with Pt electrode
- dil.H2SO4 with Cu electrode
- Fused NaOH with Pt electrode
- dil.H2SO4 with Pt electrode
Q. What is electrophillic substitution reaction?
Q. Sulphate of a metal contains 40% of metal by mass. Eqivalent wt. of metal will be
(1) 16
(2) 32
(3) 35
(4) 64
Q. Which ore contains both iron and copper?
- Cuprite
- Chalcocite
- Chalcopyrite
- Malachite
Q. Match the extraction processes listed in Column I with metals listed in Column II.
Column IColumn IIA.Self−reductionp.LeadB.Carbon reductionq.SilverC.Complex formation and displacement by metalr.CopperD.Decomposition of iodides.Boron
Column IColumn IIA.Self−reductionp.LeadB.Carbon reductionq.SilverC.Complex formation and displacement by metalr.CopperD.Decomposition of iodides.Boron
- A. ⟶ p, r; B. ⟶ q, s; C. ⟶ q; D. ⟶ s.
- A. ⟶ p, r; B. ⟶ p; C. ⟶ q; D. ⟶ s.
- A. ⟶ p, r; B. ⟶ s; C. ⟶ q; D. ⟶ s.
- A. ⟶ r; B. ⟶ p, s; C. ⟶ q; D. ⟶ s.
Q. Although there are several ores, 80% of the world copper production comes from the ore chalcopyrite (CuFeS2). The extraction of copper from chalcopyrite involves partial roasting, removal of iron and self-reduction. Iron is removed from chalcopyrite as:
- FeO
- FeS
- Fe2O3
- FeSiO3