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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
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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
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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
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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
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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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