JEE Main & Advanced Chemistry Metallurgy / धातुकर्म Question Bank

done Reduction to free Metal Total Questions - 35

• question_answer1)
  Electrometallurgical process is used to extract [MNR 1985, 89; UPSEAT  2000; MP PMT 2001]
  A)
  \[Fe\] done clear
  B)
  \[Pb\] done clear
  C)
  \[Na\] done clear
  D)
  \[Ag\] done clear
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• question_answer2)
  General method for the extraction of metal from oxide ore is [CPMT 1983; MP PET 2002]
  A)
  Carbon reduction done clear
  B)
  Reduction by aluminium done clear
  C)
  Reduction by hydrogen done clear
  D)
  Electrolytic reduction done clear
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• question_answer3)
  Function of the flux added during smelting is
  A)
  To make ore porous done clear
  B)
  To remove gangue done clear
  C)
  To make reduction easier done clear
  D)
  To precipitate slag done clear
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• question_answer4)
  Alumino-thermic process is used for the extraction of metals, whose oxides are
  A)
  Fusible done clear
  B)
  Not easily reduced by carbon done clear
  C)
  Not easily reduced by hydrogen done clear
  D)
  Strongly basic done clear
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• question_answer5)
  In blast furnace iron oxide is reduced by [MP PMT 1989; KCET 2005]
  A)
  Silica done clear
  B)
  \[CO\] done clear
  C)
  Carbon done clear
  D)
  Lime stone done clear
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• question_answer6)
  Furnaces are lined with calcium oxide because
  A)
  It gives off oxygen on heating done clear
  B)
  It gives strong light on heating done clear
  C)
  It is refractory and basic done clear
  D)
  It is not affected by acids done clear
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• question_answer7)
  The substance used in the thermite process of reducing metal ores is [MP PET 1993; CPMT 2000, 01]
  A)
  Aluminium done clear
  B)
  Thorium done clear
  C)
  Heated Pt gauge done clear
  D)
  Carbon done clear
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• question_answer8)
  The electrolytic method of reduction is employed for the preparation of metals that [MP PMT 1991; NCERT 1984; CPMT 1988; KCET 2002]
  A)
  Are weakly electropositive done clear
  B)
  Are moderately electropositive done clear
  C)
  Are strongly electropositive done clear
  D)
  Form oxides done clear
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• question_answer9)
  Which of the following metals cannot be extracted by carbon reduction process [AMU 1982]
  A)
  \[Pb\] done clear
  B)
  \[Al\]  done clear
  C)
  \[Hg\]  done clear
  D)
  \[Zn\] done clear
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• question_answer10)
  Carbon reduction process is used for the extraction of
  A)
  \[Hg\] done clear
  B)
  \[Zn\] done clear
  C)
  \[Cr\] done clear
  D)
  \[Fe\] done clear
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• question_answer11)
  Among the following groups of oxides, the group containing oxides that cannot be reduced by carbon to give the respective metals is [NCERT 1984]
  A)
  \[C{{u}_{2}}O,\,{{K}_{2}}O\] done clear
  B)
  \[F{{e}_{2}}{{O}_{3}},\,ZnO\] done clear
  C)
  \[CaO,\,{{K}_{2}}O\] done clear
  D)
  \[PbO,\,F{{e}_{3}}{{O}_{4}}\] done clear
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• question_answer12)
  Which one of the following metals is extracted by thermal reduction process? [EAMCET 1986]
  A)
  Copper done clear
  B)
  Iron done clear
  C)
  Aluminium done clear
  D)
  Magnesium done clear
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• question_answer13)
  Chemical reduction is not suitable for converting [MP PET 1994]
  A)
  Bauxite into aluminium done clear
  B)
  Cuprite into copper done clear
  C)
  Haematite into iron done clear
  D)
  Zinc oxide into zinc done clear
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• question_answer14)
  In alumino-thermite process, aluminium is used as [IIT 1983; DPMT 1980; MP PMT 1987; MP PET/PMT 1988; NCERT 1983; UPSEAT 2003]
  A)
  Oxidising agent done clear
  B)
  Flux done clear
  C)
  Reducing agent done clear
  D)
  Solder done clear
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• question_answer15)
  Which metal is extracted by electrolytic reduction method [CPMT 1984; MP PET 1997]
  A)
  \[Cu\] done clear
  B)
  \[Al\] done clear
  C)
  \[Fe\] done clear
  D)
  \[Ag\] done clear
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• question_answer16)
  Alumina
  A)
  Is a good conductor of electricity done clear
  B)
  Is a bad conductor of electricity done clear
  C)
  Melts at \[{{200}^{o}}C\] done clear
  D)
  Is an electrovalent compound done clear
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• question_answer17)
  Aluminium is prepared in large quantities by [KCET 1991, 92]
  A)
  Heating cryolite in a limited quantity of air done clear
  B)
  Reducing aluminium oxide with coke done clear
  C)
  Reducing aluminium oxide with sodium done clear
  D)
  Electrolysing aluminium oxide dissolved in fused electrolyte done clear
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• question_answer18)
  Alumina is
  A)
  \[Al{{(OH)}_{3}}\] done clear
  B)
  \[AlC{{l}_{3}}\] done clear
  C)
  \[AIN\] done clear
  D)
  \[A{{l}_{2}}{{O}_{3}}\] done clear
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• question_answer19)
  Which one of the following is used in the extraction of aluminium by electrolytic process [CPMT 1978]
  A)
  \[A{{l}_{2}}{{O}_{3}}\] done clear
  B)
  \[Al{{(OH)}_{3}}\] done clear
  C)
  \[AlC{{l}_{3}}\] done clear
  D)
  \[A{{l}_{2}}{{(S{{O}_{4}})}_{3}}\] done clear
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• question_answer20)
  Which technique is used in the manufacture of aluminium from bauxite [NCERT 1983]
  A)
  Reduction with magnesium done clear
  B)
  Reduction with coke done clear
  C)
  Electrolytic reduction done clear
  D)
  Reduction with iron done clear
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• question_answer21)
  Which of the following processes does not involve a catalyst [KCET 1991]
  A)
  Haber's process done clear
  B)
  Thermite process done clear
  C)
  Ostwald process done clear
  D)
  Contact process done clear
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• question_answer22)
  Thermite process is used to extract metals [KCET 1989]
  A)
  When their oxides can't be reduced by carbon done clear
  B)
  When their carbonates do not yield oxides by thermal decomposition done clear
  C)
  When their sulphides can't be converted into oxides by roasting done clear
  D)
  When their melting points are very high done clear
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• question_answer23)
  Iron is obtained on a large scale from \[F{{e}_{2}}{{O}_{3}}\] by [CPMT 1973, 78, 79; Orissa JEE 2005]
  A)
  Reduction with \[Al\] done clear
  B)
  Reduction with \[CO\] done clear
  C)
  Reduction with \[{{H}_{2}}\] done clear
  D)
  Reduction with sodium done clear
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• question_answer24)
  After partial roasting, the sulphide of copper is reduced by [MP PMT 1993]
  A)
  Reduction by carbon done clear
  B)
  Electrolysis done clear
  C)
  Self-reduction done clear
  D)
  Cyanide process done clear
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• question_answer25)
  High purity copper metal is obtained by [MP PMT 1991]
  A)
  Carbon reduction done clear
  B)
  Hydrogen reduction done clear
  C)
  Electrolytic reduction done clear
  D)
  Thermite reduction done clear
  View Solution play_arrow

• question_answer26)
  In the metallurgical extraction of zinc from \[ZnO\] the reducing agent used is [MP PET 1994]
  A)
  Carbon monoxide done clear
  B)
  Sulphur dioxide done clear
  C)
  Carbon dioxide done clear
  D)
  Nitric oxide done clear
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• question_answer27)
  In order to refine 'blister copper' it is melted in a furnace and is stirred with green logs of wood. The purpose is [MP PET 1996]
  A)
  To expel the dissolved gases in blister copper done clear
  B)
  To bring the impurities to surface and oxidize them done clear
  C)
  To increase the carbon content of copper done clear
  D)
  To reduce the metallic oxide impurities with hydrocarbon gases liberated from the wood done clear
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• question_answer28)
  Aluminium is produced on a large scale by electrolysis of alumina, dissolved in fused cryolite and a little fluorspar. These two electrolytes, cryolite and fluorspar are respectively
  A)
  \[N{{a}_{3}}Al{{F}_{6}}\]  and \[Ca{{F}_{2}}\] done clear
  B)
  \[Al{{F}_{3}}\] and \[KF\] done clear
  C)
  \[A{{l}_{2}}{{C}_{6}}\] and \[KCl\] done clear
  D)
  \[KCl.MgC{{l}_{2}}.6{{H}_{2}}O\] and \[Mg{{F}_{2}}\] done clear
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• question_answer29)
  Electrometallurgy is used for
  A)
  Transition metals done clear
  B)
  Most reactive metals done clear
  C)
  Noble metals done clear
  D)
  Soft metals done clear
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• question_answer30)
  The metal extracted by electrolysis of its fused salt is [MP PET/PMT 1998]
  A)
  Iron done clear
  B)
  Lead done clear
  C)
  Sodium done clear
  D)
  Copper done clear
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• question_answer31)
  Alumino-thermic process is used for metallurgy of [CPMT 1996]
  A)
  \[Pb\] done clear
  B)
  \[Ag\] done clear
  C)
  \[Al\] done clear
  D)
  None of these done clear
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• question_answer32)
  Which metal can't be obtained from electrolysis [CPMT 1997; RPET 1999]
  A)
  \[Cu\] done clear
  B)
  \[Mg\] done clear
  C)
  \[Cr\] done clear
  D)
  \[Ni\] done clear
  View Solution play_arrow

• question_answer33)
  To obtain chromium from chromic oxide \[(C{{r}_{2}}{{O}_{3}}),\] the method used is [JIPMER 2001]
  A)
  Alumino-thermic process done clear
  B)
  Electrolytic reduction done clear
  C)
  Carbon reduction done clear
  D)
  Carbon monoxide reduction done clear
  View Solution play_arrow

• question_answer34)
  The substance used in the thermite process of reducing metal ores is [CPMT 2000; KCET 2001; UPSEAT 2001]
  A)
  Aluminium done clear
  B)
  Thorium done clear
  C)
  Heated platinum gauze done clear
  D)
  Carbon done clear
  View Solution play_arrow

• question_answer35)
  Heating with carbon in absence of air is known as [DCE 2002]
  A)
  Reduction done clear
  B)
  Carbon-reduction done clear
  C)
  Smelting done clear
  D)
  Roasting done clear
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