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InterviewSolution
This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Which of the following is better reducing agent at 673K in pyrometallurgy?A. CB. `CO_(2)`C. COD. None of these |
| Answer» Correct Answer - C | |
| 2. |
By which process Pba and Sn are extracted respectively are:A. Carbon reduction and self reductionB. self reduction and Carbon reductionC. electrolytic reduction and cynanide processD. cynanide process and electrolytic reduction |
| Answer» Correct Answer - B | |
| 3. |
In which of the following isolations no reducing agent is requiredgtA. Iron from haematiteB. Tin from cassiteriteC. Mercury from cinnabarD. Zinc from zinc blende |
| Answer» Correct Answer - C | |
| 4. |
In which of the following extraction no reducing agent is required?A. Iron from haematitreB. Aluminium from bauxiteC. Magnesium from carnalliteD. Zinc from zinc blende |
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Answer» Correct Answer - B,C Mg and Al are extracted by electrolytic reduction. |
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| 5. |
Statement-1: Carbon cannot be used as a reducing agent for the extraction of second group metals. Statement-2: Second group metals are extracted from their fused salts by electrolytic reduction:A. Statement-1 is True, Statement-2 is True, Statement-2 is a correct explantion for Statement-1.B. Statement-1 is True, Statement-2 is True, Statement-2 is not a correct explantion for Statement-1.C. Statement-1 is True, Statement-2 is False.D. Statement-1 is True, Statement-2 is True. |
| Answer» Correct Answer - B | |
| 6. |
Railway wagon axles are made by heating rods of iron embedded in charcoal powerder. The process is known asA. sherardisingB. annelalingC. temperingD. case hardening |
| Answer» Correct Answer - D | |
| 7. |
Galvanisation is applying a coating ofA. ZnB. PbC. CrD. Cu |
| Answer» Correct Answer - A | |
| 8. |
Roasting of copper pyrites is done:A. to remove moistureB. to oxidise free sulphur and antimonyC. to convert pyrite completely into `Cu_(2)O and FeO`D. to remove volatle organic impurities |
| Answer» Correct Answer - A,B,D | |
| 9. |
Which of the following options are observed during roasting?A. Convert sulphide to oxide and sulphateB. Remove water of hydrationC. Melt the oreD. Remove arsenic and sulphur impurities |
| Answer» Correct Answer - A,B,D | |
| 10. |
Roasting can be performed in:A. blast furnaceB. reveberatory furnaceC. electric furnaceD. None of these |
| Answer» Correct Answer - A,B | |
| 11. |
Copper is extracted by hydrometallurgy from low grade ores. Which of the following reaction is/are involvedgtA. `Cu^(2+)(aq)+H_(2)(g) to Cu(s)+2H^(+)(aq)`B. `Cu^(2+)(aq)+Fe(s) to Cu(s)+Fe^(2+)(aq)`C. `Cu_(2)S+2Cu_(2)O overset(Delta)to 6Cu+SO_(2)`D. Both a and b |
| Answer» Correct Answer - D | |
| 12. |
Metallurigical process of zinc involves roasting of zinc sulphide followed by reduction. Metallic zinc distills over as its volatile and impurities like Cu, Pd and Fe gets condensed. The crude metal obtained is called spelter, which may be purified by:A. electrolysis processB. fractional distillaitonC. polingD. heating with idone |
| Answer» Correct Answer - A,B | |
| 13. |
The correct statemetn are:A. Generally the calcination and roasting is done blast furnaceB. The sandy and rcoky material associated with ore are called matrix.C. Froth floatation process is suitbale for sulphide ores.D. Substance that reacts with gangue to form fusible mass is called slag. |
| Answer» Correct Answer - B,C | |
| 14. |
Common impurities present in bauxite are…..A. CuOB. ZnOC. `Fe_(2)O_(3)`D. `SiO_(2)` |
| Answer» Correct Answer - C,D | |
| 15. |
The process of removing lighter gangue particles by washing in a current if water is called:A. levigationB. liquationC. copper pyritesD. bronze |
| Answer» Correct Answer - A | |
| 16. |
Which method of purification is represented by the following equations `Ti +2I_(2) overset(523K)rarr TiI_(4) overset(1700K)rarr Ti +2I_(2)`A. CupellationB. PoilingC. Van ArkelD. Zone refining |
| Answer» Correct Answer - C | |
| 17. |
`(Ag +Pb) alloy overset("Melt and add zinc")rarr (Ag +Pb +Zn) "melt" overset("Cool") rarr (LayerX)/(LayerY)` Select correct statements based on above scheme:A. Layer X contains zinc and silver.B. Layer Y conatins lead and silver but amount of silver in this layer is smaller than in the layer X.C. X and Y are immiscible layers.D. all are correct statements |
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Answer» Correct Answer - D Zn and Pb do not form alloy. |
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| 18. |
In the metallurgy of iron, the upper layer obtained in the bottom of blast furnace mainly contains:A. `CaSiO_(3)`B. it liberates oxygen on heatingC. `Fe_(2)O_(3)`D. `FeSiO_(3)` |
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Answer» Correct Answer - A Slag floates of the molten metal. |
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| 19. |
Which is correct process-mineral group in metallurgical extraction ?A. leaching:silverB. Zone-refining:leadC. Liquation:tinD. Van Arkel:Zr |
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Answer» Correct Answer - B Lead is purified by Electro refining, Zone refining is used for the purification of Si and Ge Therefore, (b) option is correct |
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| 20. |
Which of the following statement is incorrect about the extractive metallurgy of coper?A. Matte chiefly consists of iron sulphide and some ferrous oxide.B. The impurity of iron sulphide is removed as fusible slag, `FeSiO_(3)` during roasting.C. The copper pyrite is concentrated by froth floatation process.D. Copper is obtained by self reduction in bessemer converter. |
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Answer» Correct Answer - A Copper matte contain `Cu_(2)S and FeS`. |
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| 21. |
A piece of steel is heated until redness and then plunged into cold water or oil. This treatment of steel makes it:A. soft and allleableB. hard but not brittleC. more brittleD. hard and brittle |
| Answer» Correct Answer - D | |
| 22. |
Find out the number of minerals given below which contain iron as Fe(II). Haematite, Magnetite, Limonite, Siderite, Chromite, Wolframite |
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Answer» Correct Answer - 4 Magnetite, Siderite, Chromite, Wolframite, `"("overset(+2)(Fe)overset(+6)(WO_(4))")"` |
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| 23. |
Find the total number of step in the following used during the extraction of spelter from zinc blende: Poling, Electroefining, Roasting, Froth floatation method, Smelting, Magnetic separation. |
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Answer» Correct Answer - 3 Spelter contains mainly Cy and Zn (impure zinc) Froth floatation, Roasting, Smelting. |
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| 24. |
Extraction of zinc from zinc blende is achived by:A. electrolytic redcutionB. roasting followed by reduction with cabonC. roasting followed by reduction with another metalD. roasting followed by self-reduction |
| Answer» Correct Answer - B | |
| 25. |
Copper is purified by electrolytic refining of bliter copper .The current stetement about this process is (are): (i) impure `Cu`strip is used as cathode (ii)acidified aqueous` CuSO_(4)` is used as electrolyte (iii) pure `Cu` deposits at eathode (iv) impurities settle as anode -mudA. Impure Cu strip is used as cathode.B. Acidified aquesous `CuSO_(4)` is used as electrolyte.C. Pure Cu deposits at cathode.D. Impurities settle as anode mud. |
| Answer» Correct Answer - B,C,D | |
| 26. |
The purest form of metal can be obtained by: (a) electrolytic refining (b) puddling (c ) zone refining (d) chromatorgraphyA. electrolytic refiningB. puddingC. zone refiningD. chromatography |
| Answer» Correct Answer - C | |
| 27. |
For extraction of sodium from `NaC1`, the electrolytic mixture `Nac1+Na_(3)A1F_(6) +Cac1_(2)` is used. During extractions process, only sodium is deposited in cathpode but `K` and `Ca` do not becauseA. Na is more reactive than K and CaB. Na is les reactive than K and CaC. NaCl is less stable than `Na_(3)AlF_(6) and CaCl_(2)`D. the discharge potential of `Na^(+)` is less than that of `K^(+) and Ca^(2+)` ions |
| Answer» Correct Answer - D | |
| 28. |
Which of the following plots between `DeltaG^(@) and T(^(@)C)` represents the sequence of oxide of formation of a metal in its different phase as given below? Assume the metallic oxide is thermally stable in different stages `M(s)+O_(2)(g) overset(I)to MO_(2)(s)` `M(l)+O_(2)(g) overset(II)to MO_(2)(s)` `M(g)+O_(2)(g) overset(III)to MO_(2)(s)`A. B. C. D. |
| Answer» Correct Answer - C | |
| 29. |
The chemical reaction involved in roasting process: `ZnS+O_(2) to X _Y` `X+C to Z+CO` Choose the correct statementA. Compound X is amphoteric in nautre.B. X can be reduced by self reducton method.C. Y having `ppi-ppi` as well as `ppi-dpi` bond.D. Y is polar as well as planer molecule. |
| Answer» Correct Answer - A,C,D | |
| 30. |
Statement-1: In blast funcae inner surface is lining of refractory materials. Statement-2: These refractory meterials are acidic and basic in nature generally.A. Statement-1 is True, Statement-2 is True, Statement-2 is a correct explantion for Statement-1.B. Statement-1 is True, Statement-2 is True, Statement-2 is not a correct explantion for Statement-1.C. Statement-1 is True, Statement-2 is False.D. Statement-1 is True, Statement-2 is True. |
| Answer» Correct Answer - B | |
| 31. |
Carbon cannot be used in the reduction of `A1_(2)O_(3)` because:A. it is non metalB. the heat of formation of `CO_(2)` is more than that of `Al_(2)O_(3)`.C. pure carbon is not easily availableD. that heat of formation of `Al_(2)O_(3)` is too high |
| Answer» Correct Answer - D | |
| 32. |
In the electrolysis of molten alumina during the manufacture of aluminium:A. `Al_(2)O_(3)` undergoes dissociationB. cryolite undergoes dissociationC. `Al_(2)O_(3)` and cryolite both undergo dissociationD. neither of the two undergoes dissociation |
| Answer» Correct Answer - B | |
| 33. |
Which one of the following metals cannot be extracted by carbon reduction?A. PbB. FeC. ZnD. Al |
| Answer» Correct Answer - D | |
| 34. |
In electrolysis of `A1_(2)O_(3)`by Hall-Heroult process:A. cryolite `Na_(3)[AlF_(6)]` lowers the melting point of `Al_(2)O_(3)` and increases its elctrical conductivityB. Al is obtained at cathode and probably `CO_(2)` at anodeC. both a and b are correctD. None of these |
| Answer» Correct Answer - C | |
| 35. |
Which of the following metals cannot be extracted by the carbon reduction process?A. ZnB. FeC. AlD. Sn |
| Answer» Correct Answer - C | |
| 36. |
Which metal is extracted using a hydrometallurgical process involving complexation ?A. MgB. AgC. CuD. Sn |
| Answer» Correct Answer - B | |
| 37. |
Assertion : Reduction of ZnO with carbon is done at `1100^(@)C`. Reason : At this temperature, `DeltaG^(@)` is negative and the process is spontaneous.A. Statement-1 is True, Statement-2 is True, Statement-2 is a correct explantion for Statement-1.B. Statement-1 is True, Statement-2 is True, Statement-2 is not a correct explantion for Statement-1.C. Statement-1 is True, Statement-2 is False.D. Statement-1 is True, Statement-2 is True. |
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Answer» Correct Answer - A All three oxidation curves for the carbon system lie above that for oxidation of zinc, until a temperature of approximately `1000^(@)C` is reached. At this point C is thermodynamicall capable of reducing ZnO to Zn. Since this temperature is greater than the boiling point of `Zn(907^(@)C)`, it will be formed as a vapour. The overall equaltion for reduction for redcution is `ZnO(s)+C(s) to Zn(g)+CO(g)` Therefore, (a) is correct. |
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| 38. |
Statement-1:In the electrolytic reduction of `Al_(2)O_(3)`, cryolite lowes the melting point of the mixture and bring conductivity: Statement-2: Cryolite is an ore of aluminium.A. Statement-1 is True, Statement-2 is True, Statement-2 is a correct explantion for Statement-1.B. Statement-1 is True, Statement-2 is True, Statement-2 is not a correct explantion for Statement-1.C. Statement-1 is True, Statement-2 is False.D. Statement-1 is True, Statement-2 is True. |
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Answer» Correct Answer - B Statement-1: Cyrolite as impurity reduces the melting point of `Al_(2)O_(3)` from 2200K to approximately 930K and being ionic compound dissociates to give ions which bring about the conductivity of the electrolyte. Statement-2: Cryolite is `Na_(2)AlF_(4)` and is ore of aluminium. Therefore, (b) is correct. |
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| 39. |
Cryolite is:A. `Na_(3)AlF_(6)` and is used in the electrolysis of aluminia for decreasing electrical conductivity.B. `Na_(3)AlF_(6)` and is used in the electrolysis of laumina for loweing the meting point of alumina.C. `Na_(3)AlF_(6)` and is used in the elctrolytic purification of aluminia.D. `Na_(3)AlF_(6)` and is used in the electrolysis of alumina for increasing the melting point and electrical conductivity. |
| Answer» Correct Answer - B | |
| 40. |
Leaching of `Ag_(2)S` is carried out by heating it with a dilute solution of:A. NaCN onlyB. HClC. NaOHD. NaCN in presence of `O_(2)` |
| Answer» Correct Answer - D | |
| 41. |
Which of the following statements is correctA. Leaching of gold with `overset(Ө)(CN)` is an oxidation reactionB. Argentite is an oxide ore of silverC. In the precipotation of gold from the soluble complex, zinc acts as a reducing agentD. a and c both |
| Answer» Correct Answer - D | |
| 42. |
The element which could be extracted by electrolytic reduction of its oxide dissolved in a high temperature melt is:A. sodiumB. magnesiumC. fluroineD. aluminium |
| Answer» Correct Answer - D | |
| 43. |
Which of the following reaction is an example of reduction of calcined or roasted or into metal?A. `"Bauxite ore"+Na_(2)CO_(3) overset("fused")to NaAlO_(2)`B. `Ag_(2)S+NaCN Leftrightarrow Na[Ag(CN)_(2)]+Na_(2)S`C. `ZnO+C to Zn+CO`D. `CuSO_(4)(aq.)+underset("dust")(Zn) to ZnSO_(4)+Cu` |
| Answer» Correct Answer - C | |
| 44. |
Which of the following metal oxide is more stable if the free of formation of `Cr_(2)O_(3) and Al_(2)O_(3)`per mole of oxygen consumed are `-540Kj and -827kJ` respectively?A. `Cr_(2)O_(3)`B. `Al_(2)O_(3)`C. Both have equal stablilityD. None of these |
| Answer» Correct Answer - B | |
| 45. |
`SnO_(2)` is reduced to metallic Sn on smelting oxide with anthracte, limestone and sand. In this, function of sand is:A. it acts as a fluxB. it liberates oxygen on heatingC. both are correctD. none is correct |
| Answer» Correct Answer - C | |
| 46. |
How many of the given consequences are in general the result of roasting and/or calcination of concentrated ores? (a) Removal of mositures (b) Reduction of metal oxides into metal (c ) Removal of volatile impurities as elemental vapour or volatile oxides (d) Conversion of concentrated ores into correspondin oxides (e) Melting of concentrated ores (f) Ores become porous |
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Answer» Correct Answer - 4 a, c,d.f |
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| 47. |
How many of the following metals is extracted by self reduction process? Pb,Au,Mg,Sn,Fe,Al,Ag,Hg,Na,Zn,Cu,Ca |
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Answer» Correct Answer - 3 Pb,Cu,Hg |
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| 48. |
The anode mud in the electrolytic refining of silver contains :A. Zn.Cu,Ag.AuB. Zn,Ag,AuC. Cu,Ag,AuD. Au only |
| Answer» Correct Answer - D | |
| 49. |
Froth flotation process used for the concentration of sulphide ore.A. is based on the difference in wetablity of different mineralsB. used xanthates and fatty acids as collectors.C. uses NaCN as depressant in the mixtures of ZnS and PbS when ZnS soluble complex and PbS forms froth.D. all are correct statements |
| Answer» Correct Answer - D | |
| 50. |
The given outline depicts the extraction of:A. `"Ag from" Ag_(2)S`B. Zn from ZnSC. Pb from PbSD. `"Cu from" CuFeS_(2)` |
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Answer» Correct Answer - C PbS will be reduced by self reduction as well as carbon reduction method. |
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