InterviewSolution
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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. |
Oxygen is the most abundant element. Aluminium is the most abundant metal.A. If both (A) and ( R) are correct and ( R) is the correct explanation of (A).B. If both (A) and ( R) are correct, but ( R) is not the correct explanation of (A).C. If (A) is correct, but ( R) is incorrect.D. If (A) is incorrect, but ( R) is correct. |
| Answer» Correct Answer - B | |
| 2. |
All metals cannot be obtained by carbon reduction. Carbon is a very strong reducing agent.A. If both (A) and ( R) are correct and ( R) is the correct explanation of (A).B. If both (A) and ( R) are correct, but ( R) is not the correct explanation of (A).C. If (A) is correct, but ( R) is incorrect.D. If (A) is incorrect, but ( R) is correct. |
| Answer» Correct Answer - A | |
| 3. |
Select the correct statements for Ellingham diagram.A. The slope of the curves of the formation of metal oxide is `+ve` because `Delta_(f) G^(Ө)` becomes less negative or increases with the rise in temperature.B. Each curve is a straight line except when some change takes place in phase `(s rarr 1 or 1 rarr g)`C. Each curve is not a straight line except when some changes takes place in phase `(s rarr 1 or 1 rarr g)`.D. The slope of the curves of the formation of metal oxide is `-ve` becomes less negative or increases with the rise in temperature. |
| Answer» Correct Answer - B::D | |
| 4. |
Which of the following statements is/are correct ?A. The chemical processes in the production of steel from haematite ore involve reduction followed by oxidation.B. Lead is extracted from its chief ore galena by both carbon reduction as well as self-reduction.C. In Hall-Heroult process, the electrolyte used is a molten mixture of alumina and cryolite or fluorspar.D. Haematite, cassiterite and argentite are oxide ores. |
| Answer» Correct Answer - A::B::C | |
| 5. |
Select the correct statements for calcination :A. Carbonate ore is converted in oxide oreB. Hydrated oxide ore is converted into its oxide oreC. Oxidisable volatile impurities are removed by calcination processD. Only calcination occurs for carbinate or oxide ore |
| Answer» Correct Answer - A::B | |
| 6. |
Calcination is the process of heating the ore strongly in the _____of air. |
| Answer» Correct Answer - Absence or limited supply | |
| 7. |
An ore of tin containing `FeCrO_(4)` is concentrated by _____. |
| Answer» Correct Answer - Elelctomagnetic separation | |
| 8. |
In the leaching of `Ag_(2)S` with `NaCN`, a stream air is also passed. It is because ofA. Reversible nature of reaction between `Ag_(2)S` and `NaCN`B. Oxidised `Na_(2)S` formed into `Na_(2)SO_(4)`C. Irreversible nature of reaction between `Ag_(2)S` and `NaCN`D. None of above |
| Answer» Correct Answer - A::B | |
| 9. |
The metal present in chlorophyll is ______ |
| Answer» Correct Answer - Magnesium | |
| 10. |
For the pyrometallurgical method used for the extraction of copper from sulphide ore, which statements is//are correct ?A. Pyrometallurgy is a dry methodB. It involves concentration by leaching the sulphide ore with dil. `H_(2)SO_(4)`.C. It involves concentration of the sulphide ore by froth flotation processD. It involves concentration by leaching for every ore. |
| Answer» Correct Answer - A::C | |
| 11. |
The extraction of metals from sulphide ore involvesA. Reduction with carbonB. Froth flotationC. Reduction with `Al`D. Electrolytic reduction |
| Answer» Correct Answer - A::B | |
| 12. |
`MgO` can be used as a refractory material becauseA. It is a good electrical insulatorB. It is a good conductor of heatC. It has high melting pointD. None of the above |
| Answer» Correct Answer - A::B::C | |
| 13. |
The purification of crude metals is referred to ______. |
| Answer» Correct Answer - Refining | |
| 14. |
Select the correct statements :A. In hydrometallurgy, `Zn` is used as oxidising agent in the purification of `Ag` from `[Ag(CN)_(2)]^(Ө)`.B. When pine oil or eucalyptus oil is added into the water, it lowers down the surface tension by which froth is formed.C. Sodium ethyl xanthate is used as collectorD. Basic copper carbonate or `PbSO_(4)` is concentrated by froth flotation method by using an activator. |
| Answer» Correct Answer - B::C::D | |
| 15. |
The etraction of metals from oxide ores involvesA. Reduction with carbonB. Reduction with aluminiumC. Electrolytic reductionD. Reduction with `CO` |
| Answer» Correct Answer - A::B::C::D | |
| 16. |
Granulated zinc is obtained byA. Suddently cooling molten zincB. Adding molten zinc to waterC. Heating zinc to `150^@ C`D. Dropping molten zinc drop by drop |
| Answer» Correct Answer - B | |
| 17. |
`Ca_(3)(PO_(4))_(2)` is :A. Thomos slagB. Used in cement manufacturingC. Used in manufacture of phosphorus fertiliserD. Used as a refractory meterial |
| Answer» Correct Answer - A::B::C | |
| 18. |
Metallury involves steps :A. Cencentration of oreB. Reduction of oreC. PurificationD. Alloy formation |
| Answer» Correct Answer - A::B::C | |
| 19. |
Which of the following are correct processes ?A. `Fe + Al_(2) O_(3) rarr 2Al + Fe_(2) O_(3)`B. `ZnO + C rarr Zn + CO`C. `Cr_(2)O_(3) + 2 Al rarr 2Cr + Al_(2) O_(3)`D. `2[Ag(CN)_(2)]^(Ө) + Zn rarr 2Ag +[Zn(CN)_(4)]^(2-)`. |
| Answer» Correct Answer - B::C::D | |
| 20. |
Furances are lined with calcium oxide asA. It gives light on heatingB. It is refractory and basicC. It is not affected by acidsD. It gives `O_(2)` on heating |
| Answer» Correct Answer - B | |
| 21. |
Chalcogens areA. HydrocarbonsB. Ore-forming elementsC. Oxide-forming elementsD. Those having ability to catenate |
| Answer» Correct Answer - B | |
| 22. |
Graphite is used as anode but diamond is not. There exist free electrons between two parallel sheets of graphite, hence it helps in electrode conduction.A. If both (A) and ( R) are correct and ( R) is the correct explanation of (A).B. If both (A) and ( R) are correct, but ( R) is not the correct explanation of (A).C. If (A) is correct, but ( R) is incorrect.D. If (A) is incorrect, but ( R) is correct. |
| Answer» Correct Answer - A | |
| 23. |
Assertion: Aluminothermy is used for extraction of chromium form chromium oxide. Reason: Alumina has a high melting point.A. If both (A) and ( R) are correct and ( R) is the correct explanation of (A).B. If both (A) and ( R) are correct, but ( R) is not the correct explanation of (A).C. If (A) is correct, but ( R) is incorrect.D. If (A) is incorrect, but ( R) is correct. |
| Answer» Correct Answer - B | |
| 24. |
Which of the following benefication processes is used for the mineral `Al_(2)O_(3).2H_(2)O` ?A. Froth flotationB. LeachingC. LiquationD. Magnetic separation |
| Answer» Correct Answer - B | |
| 25. |
The impurities associated with the ore after mining are collectively calledA. FluxB. SlagC. MineralsD. Gangue |
| Answer» Correct Answer - D | |
| 26. |
The anode mud obtained during electrorefining of copper may contain.A. IronB. MagnesiumC. SilverD. Gold |
| Answer» Correct Answer - C::D | |
| 27. |
Extraction of aluminium can be understood by : Electrolytric reduction of `Al_(2) O_(3)` : Electrolysis : `Al_(2) O_(3) + Cryolite + CaF_(2)` Cathode : Carbon inside the `Fe` container Anode : Graphite rods. The function of fluorspar `(CaF_(2))` is.A. To increase the melting point of electrolyteB. To increase electrolytic conductivity powerC. To remove the impurities as slagD. All of these |
| Answer» Correct Answer - B | |
| 28. |
Extraction of aluminium can be understood by : Electrolytric reduction of `Al_(2) O_(3)` : Electrolysis : `Al_(2) O_(3) + Cryolite + CaF_(2)` Cathode : Carbon inside the `Fe` container Anode : Graphite rods. Coke power is spread over the molten electroltyte to.A. Prevent the corrosion of graphite anodeB. Prevent the heat radiation form the surfaceC. Prevent the oxidation of molten aluminium by airD. Both (a) and (b) |
| Answer» Correct Answer - D | |
| 29. |
Extraction of aluminium can be understood by : Electrolytric reduction of `Al_(2) O_(3)` : Electrolysis : `Al_(2) O_(3) + Cryolite + CaF_(2)` Cathode : Carbon inside the `Fe` container Anode : Graphite rods. The purpose of adding cryolite is.A. To remove the impurities as slagB. To lower the melting point of `Al_(2) O_(3)`C. To decrease the electrical conductivity of pure aluminiumD. To increase the `Al` percentage in the yield |
| Answer» Correct Answer - B | |
| 30. |
Lead obtained from galena ore `(PbS)` by air reduction or carbon reduction process contains base metal `(cu, Bi, As, Sn,Zn)` as impurities. The removal of the impurity of `Ag` from the commercial lead is called.A. `PbSO_(4) + H_(2) SO_(4)`B. `PbCl_(2) + HCl`C. `PbSiF6 + H_(2) SiF_(6)`D. None of these |
| Answer» Correct Answer - C | |
| 31. |
Zone refining is used to obtain metals in high degree of purity. During electrorefining pure metal is liberated at the cathode.A. If both (A) and ( R) are correct and ( R) is the correct explanation of (A).B. If both (A) and ( R) are correct, but ( R) is not the correct explanation of (A).C. If (A) is correct, but ( R) is incorrect.D. If (A) is incorrect, but ( R) is correct. |
| Answer» Correct Answer - B | |
| 32. |
The metal like `Si, Ga` etc., which are used in semiconductors, are purified by ______. |
| Answer» Correct Answer - Zone refining | |
| 33. |
Spelter isA. Impure zincB. Impure ironC. Pure zincD. Impure aluminium |
| Answer» Correct Answer - A | |
| 34. |
`DeltaG^(@) vsT` plot in the Ellingham diagram slopes down for the reaction.A. `Mg + (1)/(2) O_(2) rarr MgO`B. `2Ag + (1)/(2) O_(2) rarr Ag_(2) O`C. `C + (1)/(2) O_(2) rarr CO`D. `CO + (1)/(2) O_(2) rarr CO_(2)` |
| Answer» Correct Answer - C | |
| 35. |
Auto-reduction process is used for the extraction of :A. `Hg`B. `Cu`C. `Pb`D. `Fe` |
| Answer» Correct Answer - D | |
| 36. |
Self-reduction of `Cu_(2)S` to `Cu` can be carried out in.A. Bessemer converterB. Blast furnaceC. Both (a) and (b)D. None of these |
| Answer» Correct Answer - A | |
| 37. |
Identify the reaction that does not take place in a blast furnaceA. `2Fe_(2)O_(3) + 3C rarr 4Fe + 3CO_(2)`B. `CO_(2) + C rarr 2CO`C. `CaCO_(3) rarr CaO + CO_(2)`D. `FeO + SiO_(2) rarr FeSiO_(3)` |
| Answer» Correct Answer - B | |
| 38. |
The process of isolation of metals by dissolving the ore in a suitable chemical reagent followed by precipitation of the metal by a more electropositive metal is calledA. ElectrometallurgyB. HydrometallurgyC. Electro refiningD. Zone refining |
| Answer» Correct Answer - B | |
| 39. |
(vi) Which element is purified by zone refining ?A. GeB. SiC. SnD. Ni |
| Answer» Correct Answer - A::B | |
| 40. |
`KCN` forms soluble complex with silver galance. |
| Answer» Correct Answer - T | |
| 41. |
Extraction of copper is done using copper pyrites. After roasting, the ore is mixed with silica and coke and then smelted in a blast furnace. The matte obtained from the blast furnace is charged into a silica-lined converter. Some silica is also added, and a hot air blast is blown into the mixture to obtain blister copper, which is purified by electrorefining. Matte is a mixture ofA. `Cu_(2) S + FeS` (small amount)B. `FeS + Cu_(2) S` (small amount)C. `Cu_(2) O + FeO` (small amount)D. `FeO + Cu_(2) S` (small amount) |
| Answer» Correct Answer - A | |
| 42. |
Extraction of copper is done using copper pyrites. After roasting, the ore is mixed with silica and coke and then smelted in a blast furnace. The matte obtained from the blast furnace is charged into a silica-lined converter. Some silica is also added, and a hot air blast is blown into the mixture to obtain blister copper, which is purified by electrorefining. Coke is added during smelting to.A. Reduce `FeO` to `Fe`B. Reduce `Cu_(2) O` to `Cu`C. Check the oxidation of `FeO` to `Fe_(2) O_(3)`D. Check the oxidation of `Cu_(2) O` to `CuO`. |
| Answer» Correct Answer - A | |
| 43. |
Extraction of copper is done using copper pyrites. After roasting, the ore is mixed with silica and coke and then smelted in a blast furnace. The matte obtained from the blast furnace is charged into a silica-lined converter. Some silica is also added, and a hot air blast is blown into the mixture to obtain blister copper, which is purified by electrorefining. The chemical formula of copper pyrites is.A. `CuFeS_(2)`B. `Cu_(2) O`C. `Cu_(2) S`D. `CuCO_(3).Cu(OH)_(2)` |
| Answer» Correct Answer - A | |
| 44. |
In the commercial extraction of iron, roasting is adopted becauseA. It removes impurities of `S, As` and `Sb` in the form of their elemental vapourB. It prevents slag formation by `Fe_(2)O_(3)`C. It prevents slag formation by `FeO`D. Limonite is converted into its anhydrous form |
| Answer» Correct Answer - C::D | |
| 45. |
In `Fe` extraction, the roasting is carried out becauseA. All `FeO` be converted to `Fe_(2)O_(3)`B. The formation of `FeSiO_(3)` slag is preventedC. `Fe_(2)O_(3)` does not react with `SiO_(2)` to0 from slagD. The formation of slag `(CaSiO_(3))` is enhanced. |
| Answer» Correct Answer - A::B::C | |
| 46. |
Consider the following statements . Roasting is carried out to `:` `(i)` convert sulphide to oxide and sulphate. `(ii)` to remove impurities of `CuS` and `FeS` present in the ore of tin stone `(SnO_(2))` as `CuSO_(4)` and `FeSO_(4)`. `(iii)` melt the ore. `(iv)` remove arsenic and sulphur impurities. of these statements.A. 1,2 and 3 are correctB. 1 and 4 are correctC. 1,2 and 4 are correctD. 2,3 and 4 are correct. |
| Answer» Correct Answer - C | |
| 47. |
Roasting is generally carried out in _____mineral. |
| Answer» Correct Answer - Sulphide | |
| 48. |
Coating of zinc on iron objects is commonly known as _____.A. GalvanisationB. Surface coatingC. ElectroplatingD. Hydroplating |
| Answer» Correct Answer - A | |
| 49. |
Zinc blende is the ore of _____. |
| Answer» Correct Answer - Zinc | |
| 50. |
The process of removal of gangue form ore is known as _____. |
| Answer» Correct Answer - Concenyration of ore | |