JEE Main & Advanced Chemistry Metallurgy / धातुकर्म Question Bank

done Roasting and Calcination Total Questions - 60

• question_answer1)
  Refractory materials are generally used in furnaces because [MNR 1980; MP PMT 1986]
  A)
  They possess great structural strength done clear
  B)
  They can withstand high temperature done clear
  C)
  They are chemically inert done clear
  D)
  They do not require replacement done clear
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• question_answer2)
  Main function of roasting is [MP PET/PMT 1988]
  A)
  To remove volatile substances done clear
  B)
  Oxidation done clear
  C)
  Reduction done clear
  D)
  Slag formation done clear
  View Solution play_arrow

• question_answer3)
  Roasting is generally done in case of the following [MP PMT 1985]
  A)
  Oxide ores done clear
  B)
  Silicate ores done clear
  C)
  Sulphide ores done clear
  D)
  Carbonate ores done clear
  View Solution play_arrow

• question_answer4)
  Heating of pyrites in air for oxidation of sulphur is called [CPMT 1973, 75, 78, 79, 94; DPMT 1982, 84, 86;  MP PMT 2000, 01, 02]
  A)
  Roasting done clear
  B)
  Calcination done clear
  C)
  Smelting done clear
  D)
  Slagging done clear
  View Solution play_arrow

• question_answer5)
  Which is not basic flux [CPMT 1986]
  A)
  \[CaC{{O}_{3}}\] done clear
  B)
  Lime done clear
  C)
  \[Si{{O}_{2}}\] done clear
  D)
  \[CaO\] done clear
  View Solution play_arrow

• question_answer6)
  A substance which reacts with gangue to form fusible material is called [MP PMT 1990; Kurukshetra CEE 1998]
  A)
  Flux done clear
  B)
  Catalyst done clear
  C)
  Ore done clear
  D)
  Slag done clear
  View Solution play_arrow

• question_answer7)
  When lime stone is heated strongly, it gives off \[C{{O}_{2}}\]. In metallurgy this process is known as [MP PET/PMT 1988]
  A)
  Calcination done clear
  B)
  Roasting done clear
  C)
  Smelting done clear
  D)
  Ore dressing done clear
  View Solution play_arrow

• question_answer8)
  Electric furnaces are lined with magnesia because
  A)
  It is not affected by acids done clear
  B)
  It gives oxygen on heating done clear
  C)
  It melts at very high temperature done clear
  D)
  It has no effect of electricity done clear
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• question_answer9)
  Purpose of smelting of an ore is [MP PMT 1990, 2001; Kurukshetra CEE 1998; RPMT 2000]
  A)
  To oxidise it done clear
  B)
  To reduce it done clear
  C)
  To remove vaporisable impurities done clear
  D)
  To obtain an alloy done clear
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• question_answer10)
  Smelting is done in [DPMT 1979]
  A)
  Blast furnace done clear
  B)
  Muffle furnace done clear
  C)
  Open-hearth furnace done clear
  D)
  Electric furnace done clear
  View Solution play_arrow

• question_answer11)
  In order to bring initial chemical change in the ore, the process of heating of ore below its melting point is known as
  A)
  Reduction done clear
  B)
  Smelting done clear
  C)
  Calcination done clear
  D)
  Roasting done clear
  View Solution play_arrow

• question_answer12)
  Matte contains mainly [KCET 2000]
  A)
  \[C{{u}_{2}}S\]and \[FeS\] done clear
  B)
  \[CuS\]and \[F{{e}_{2}}{{S}_{3}}\] done clear
  C)
  \[Fe\] done clear
  D)
  \[C{{u}_{2}}S\] done clear
  View Solution play_arrow

• question_answer13)
  The substance which is mixed with the ore for removal of impurities is termed as [MP PMT 1985, 87, 90; CPMT 1996; JIPMER 2002]
  A)
  Slag done clear
  B)
  Gangue done clear
  C)
  Flux done clear
  D)
  Catalyst done clear
  View Solution play_arrow

• question_answer14)
  The cheap and having high melting point compound used in furnace is [CPMT 1975]
  A)
  \[PbO\] done clear
  B)
  \[CaO\] done clear
  C)
  \[HgO\] done clear
  D)
  \[ZnO\] done clear
  View Solution play_arrow

• question_answer15)
  Which of the following substance can be used for drying gases [EAMCET 1978; MP PET 1999]
  A)
  \[CaC{{O}_{3}}\] done clear
  B)
  \[N{{a}_{2}}C{{O}_{3}}\] done clear
  C)
  \[NaHC{{O}_{3}}\] done clear
  D)
  \[CaO\] done clear
  View Solution play_arrow

• question_answer16)
  Which one of the furnaces among the following can produce the highest temperature
  A)
  Muffle furnace done clear
  B)
  Blast furnace done clear
  C)
  Reverberatory furnace done clear
  D)
  Electric furnace done clear
  View Solution play_arrow

• question_answer17)
  The process of heating the ore strongly in excess of air so that the volatile impurities are removed and the ore is changed to oxide is known as [AMU 1985; NCERT 1990]
  A)
  Calcination done clear
  B)
  Roasting done clear
  C)
  Froth floatation done clear
  D)
  Leaching done clear
  View Solution play_arrow

• question_answer18)
  The role of calcination in metallurgical operations is [AMU 1984]
  A)
  To remove moisture done clear
  B)
  To decompose carbonate done clear
  C)
  To drive off organic matter done clear
  D)
  To achieve all the above done clear
  View Solution play_arrow

• question_answer19)
  Calcination is the process of heating the ore [CPMT 1982]
  A)
  In a blast furnace done clear
  B)
  In absence of air done clear
  C)
  In presence of air done clear
  D)
  None of these done clear
  View Solution play_arrow

• question_answer20)
  Smelting is termed to the process in which [MP PMT 1987]
  A)
  The ore is heated in the absence of air done clear
  B)
  Ore is cold done clear
  C)
  The ore is heated in the presence of air done clear
  D)
  Ore is melted done clear
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• question_answer21)
  The metallurgical process in which a metal is obtained in a fused state is called [IIT 1978; MP PET 1997]
  A)
  Smelting done clear
  B)
  Roasting done clear
  C)
  Calcination done clear
  D)
  Froth floatation done clear
  View Solution play_arrow

• question_answer22)
  Which of the following processes involves smelting [NCERT 1983]
  A)
  \[ZnC{{O}_{3}}\to ZnO+C{{O}_{2}}\] done clear
  B)
  \[F{{e}_{2}}{{O}_{3}}+3C\to 2Fe+3CO\] done clear
  C)
  \[2PbS+3{{O}_{2}}\to 2PbO+2S{{O}_{2}}\] done clear
  D)
  \[A{{l}_{2}}{{O}_{3}}.2{{H}_{2}}O\to A{{l}_{2}}{{O}_{3}}+2{{H}_{2}}O\] done clear
  View Solution play_arrow

• question_answer23)
  Reverberatory furnace is employed in the metallurgical process mainly for [MP PMT 1994]
  A)
  Reduction of oxide ores done clear
  B)
  Smelting of sulphide ores done clear
  C)
  Conversion of chloride to sulphate done clear
  D)
  Getting magnetic materials done clear
  View Solution play_arrow

• question_answer24)
  In metallurgy, flux is a substance used to convert [EAMCET 1988]
  A)
  Infusible impurities to fusible material done clear
  B)
  Soluble impurities to insoluble impurities done clear
  C)
  Fusible impurities to infusible impurities done clear
  D)
  Mineral into silicate done clear
  View Solution play_arrow

• question_answer25)
  In the manufacture of iron lime stone added to the blast furnace, the calcium ion ends in the form of [MP PMT 1989; CPMT 1989; KCET 1993; IIT 1982; MADT Bihar 1995]
  A)
  Slag done clear
  B)
  Gangue done clear
  C)
  Calcium metal done clear
  D)
  \[CaC{{O}_{3}}\] done clear
  View Solution play_arrow

• question_answer26)
  Flux added in the extraction of iron is
  A)
  Silica done clear
  B)
  Felspar done clear
  C)
  Limestone done clear
  D)
  Flint done clear
  View Solution play_arrow

• question_answer27)
  The smelting of iron in the blast furnace involves all the following process except
  A)
  Oxidation done clear
  B)
  Reduction done clear
  C)
  Decomposition done clear
  D)
  Sublimation done clear
  View Solution play_arrow

• question_answer28)
  In the manufacture of iron from haematite, the function of lime stone is as [CPMT 1988; MP PET 1991, 93, 95]
  A)
  A reducing agent done clear
  B)
  Flux done clear
  C)
  Slag done clear
  D)
  Gangue done clear
  View Solution play_arrow

• question_answer29)
  The slag obtained during the extraction of copper from copper pyrites is composed mainly of [MNR 1993; MP PMT 1997; UPSEAT 2000, 01;  IIT-JEE Screening 2001]
  A)
  \[CaSi{{O}_{3}}\] done clear
  B)
  \[FeSi{{O}_{3}}\] done clear
  C)
  \[CuSi{{O}_{3}}\] done clear
  D)
  \[Si{{O}_{2}}\] done clear
  View Solution play_arrow

• question_answer30)
  Complex is formed in the extraction of [MP PET 1989]
  A)
  \[Na\] done clear
  B)
  \[Cu\] done clear
  C)
  \[Ag\] done clear
  D)
  \[Fe\] done clear
  View Solution play_arrow

• question_answer31)
  Which of the following metal is extracted by amalgamation process
  A)
  Tin done clear
  B)
  Silver done clear
  C)
  Copper done clear
  D)
  Zinc done clear
  View Solution play_arrow

• question_answer32)
  The reaction \[2ZnS+3{{O}_{2}}\to 2ZnO+2S{{O}_{2}}\] in the metallurgical process of zinc is called [MP PET 1994]
  A)
  Calcination done clear
  B)
  Cupellation done clear
  C)
  Smelting done clear
  D)
  Roasting done clear
  View Solution play_arrow

• question_answer33)
  Calcination is used in metallurgy for removal of [AFMC 1995]
  A)
  Water and sulphide done clear
  B)
  Water and \[C{{O}_{2}}\] done clear
  C)
  \[C{{O}_{2}}\] and \[{{H}_{2}}S\] done clear
  D)
  \[{{H}_{2}}O\] and \[{{H}_{2}}S\]   done clear
  View Solution play_arrow

• question_answer34)
  Which of the following is slag [CPMT 1994]
  A)
  \[CaO\] done clear
  B)
  \[CaS{{O}_{4}}\] done clear
  C)
  \[CaSi{{O}_{3}}\] done clear
  D)
  \[Si{{O}_{2}}\] done clear
  View Solution play_arrow

• question_answer35)
  The impurties associated with minerals used in metallurgy are collectively called [MP PMT 1995; RPMT 1999]
  A)
  Slag done clear
  B)
  Flux done clear
  C)
  Gangue done clear
  D)
  Ore done clear
  View Solution play_arrow

• question_answer36)
  When a metal is to be extracted from its ore, if the gangue associated with the ore is silica, then [MP PET 1996]
  A)
  An acidic flux is needed done clear
  B)
  A basic flux is needed done clear
  C)
  Both acidic and basic flux are needed done clear
  D)
  Neither of them is needed done clear
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• question_answer37)
  Which statement is correct
  A)
  Gangues are carefully chosen to combine with the slag present in the ore to produce easily fusible flux to carry away the impurities done clear
  B)
  Slags are carefully chosen to combine with the flux present in the ore to produce easily fusible gangue to carry away the impurities done clear
  C)
  Gangues are carefully chosen to combine with the flux present in the ore to produce easily fusible slag to carry away the impurities done clear
  D)
  Fluxes are carefully chosen to combine with the gangue present in the ore to produce easily fusible slag to carry away the impurities done clear
  View Solution play_arrow

• question_answer38)
  Roasting of copper pyrites ores is for the following purposes
  A)
  To burn off sulphur, arsenic, antimony etc. as oxides and convert all the iron and copper to their oxides done clear
  B)
  To burn off arsenic, antimony etc. as oxides and burn off sulphur so that enough of it remains to combine with all the copper done clear
  C)
  To burn off sulphur partially to leave enough to combine with arsenic, antimony etc. and to convert all the iron and copper to oxides done clear
  D)
  To melt arsenic and antimony sulphides etc. and remove them by liquation and to burn off sulphur partially to leave enough to combine with copper and iron done clear
  View Solution play_arrow

• question_answer39)
  In the modern blast furnaces, the charge consists of a mixture of
  A)
  Calcined iron oxides + lime + anthracite coal done clear
  B)
  Calcined iron oxides + limestone + coke done clear
  C)
  Hydrated iron oxides + dolomite + coke done clear
  D)
  Iron pyrites + lime +bituminous coal done clear
  View Solution play_arrow

• question_answer40)
  Roasting involves
  A)
  Only volatilisation of volatile impurities done clear
  B)
  Only volatilisation of volatile impurities and decomposition of the ore done clear
  C)
  Volatilisation of volatile impurities and decomposition and oxidation of the ore done clear
  D)
  Oxidation and reduction of the ore and slag formation done clear
  View Solution play_arrow

• question_answer41)
  Which of the following ores is subjected to roasting during metallurgical operations for getting the metal oxide
  A)
  Horn silver done clear
  B)
  Zinc blende done clear
  C)
  Malachite done clear
  D)
  Limonite done clear
  View Solution play_arrow

• question_answer42)
  A metal obtained directly by roasting of its sulphide ore is [Pune CET 1998]
  A)
  \[Cu\] done clear
  B)
  \[Pb\] done clear
  C)
  \[Hg\] done clear
  D)
  \[Zn\] done clear
  View Solution play_arrow

• question_answer43)
  In blast furnace, the highest temperature is in [KCET 1998]
  A)
  Reduction zone done clear
  B)
  Slag zone done clear
  C)
  Fusion zone done clear
  D)
  Combustion zone done clear
  View Solution play_arrow

• question_answer44)
  The process of roasting of an ore is carried out in the [BHU 1999]
  A)
  Absence of air done clear
  B)
  Presence of air done clear
  C)
  Limited supply of air done clear
  D)
  None of these done clear
  View Solution play_arrow

• question_answer45)
  Flux is used to remove [AIIMS 1999]
  A)
  Acidic impurities done clear
  B)
  Basic impurities done clear
  C)
  All impurities from ores done clear
  D)
  Both a and b done clear
  View Solution play_arrow

• question_answer46)
  During extraction of \[Fe\]; slag obtained is [CPMT 2000]
  A)
  \[FeO\] done clear
  B)
  \[FeSi{{O}_{3}}\] done clear
  C)
  \[MgSi{{O}_{3}}\] done clear
  D)
  \[CaSi{{O}_{3}}\] done clear
  View Solution play_arrow

• question_answer47)
  The final step for the extraction of copper from copper pyrite in Bessemere converter involves the reaction [CPMT 2000]
  A)
  \[4C{{u}_{2}}O+FeS\to 8Cu+FeS{{O}_{4}}\] done clear
  B)
  \[C{{u}_{2}}S+2C{{u}_{2}}O\to 6Cu+S{{O}_{2}}\] done clear
  C)
  \[2C{{u}_{2}}O+FeS\to 4Cu+Fe+S{{O}_{2}}\] done clear
  D)
  \[C{{u}_{2}}S+2FeO\to 2Cu+2FeCO+S{{O}_{2}}\] done clear
  View Solution play_arrow

• question_answer48)
  Flux is used to remove [KCET (Med.) 2000; PCET 2004]
  A)
  Silica done clear
  B)
  Metal oxide done clear
  C)
  All impurities from ores done clear
  D)
  Silica and undesirable metal oxide done clear
  View Solution play_arrow

• question_answer49)
  Roasting is done in [AFMC 2001]
  A)
  Blast furnace done clear
  B)
  Open hearth furnace done clear
  C)
  Electric furnace done clear
  D)
  None of these done clear
  View Solution play_arrow

• question_answer50)
  Which of the following fluxes is used to remove acidic impurities in metallurgical process [KCET (Med.) 2001]
  A)
  Silica done clear
  B)
  Lime stone done clear
  C)
  Sodium chloride done clear
  D)
  Sodium carbonate done clear
  View Solution play_arrow

• question_answer51)
  Refractory metals are used in construction of furnaces because [CPMT 2002]
  A)
  They can withstand high temperature done clear
  B)
  They are chemically inert done clear
  C)
  Their melting point is high done clear
  D)
  None of these done clear
  View Solution play_arrow

• question_answer52)
  \[C{{N}^{-}}\]solution used in extraction of which metal [RPMT 2002]
  A)
  \[Ag\] done clear
  B)
  \[Ti\] done clear
  C)
  \[Zn\] done clear
  D)
  \[Sn\] done clear
  View Solution play_arrow

• question_answer53)
  In a line kiln, to get higher yield of \[C{{O}_{2}}\], the measure that can be taken is [KCET 2003]
  A)
  To remove \[CaO\] done clear
  B)
  To add more \[CaC{{O}_{3}}\] done clear
  C)
  To maintain high temperature done clear
  D)
  To pump out \[C{{O}_{2}}\] done clear
  View Solution play_arrow

• question_answer54)
  Which metal is used as a reducing agent in smelting [MP PET 2003]
  A)
  C done clear
  B)
  Al done clear
  C)
  Zn done clear
  D)
  None of these done clear
  View Solution play_arrow

• question_answer55)
  Inner layer of blast furnace is made of [MP PMT 1990]
  A)
  Graphite bricks done clear
  B)
  Silica bricks done clear
  C)
  Fire- clay bricks done clear
  D)
  Basic bricks done clear
  View Solution play_arrow

• question_answer56)
  Blast furnace is employed in the smelting of oxide ore with coke and flux in the metallurgy of
  A)
  Iron done clear
  B)
  Copper done clear
  C)
  Lead done clear
  D)
  All the above done clear
  View Solution play_arrow

• question_answer57)
  How is limestone used in Fe extraction [Orissa JEE 2004]
  A)
  Oxidation of Fe ore done clear
  B)
  Reduction of Fe ore done clear
  C)
  Formation of slag done clear
  D)
  Purification of Fe formed done clear
  View Solution play_arrow

• question_answer58)
  Heating mixture of \[C{{u}_{2}}O\] and \[C{{u}_{2}}S\] will give [AIEEE 2005]
  A)
  \[Cu+S{{O}_{2}}\] done clear
  B)
  \[Cu+S{{O}_{3}}\] done clear
  C)
  \[CuO+CuS\] done clear
  D)
  \[C{{u}_{2}}S{{O}_{3}}\] done clear
  View Solution play_arrow

• question_answer59)
  Heating of ore in presence of air to remove sulphur impurities is called [AFMC 2005]
  A)
  Calcination done clear
  B)
  Roasting done clear
  C)
  Smelting done clear
  D)
  None of these done clear
  View Solution play_arrow

• question_answer60)
  The important step in the extraction of metal from carbonate ore is
  A)
  Calcination done clear
  B)
  Roasting done clear
  C)
  Electro-reduction done clear
  D)
  Cupellation done clear
  View Solution play_arrow