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question_answer1)
Sulphide ores are generally concentrated by [CPMT 1980, 82; EAMCET 1980; MNR 1981; DPMT 1982; KCET 1993]
A)
Froth floatation process done
clear
B)
Magnetic separation done
clear
C)
Gravity separation done
clear
D)
By hand picking done
clear
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question_answer2)
Froth floatation process is used for the concentration of [NCERT 1984; CPMT 1982, 87; MP PMT 1989; BHU 1997; EAMCET 1983; AMU 1984; DPMT 1989; AFMC 2000; MNR 1981; KCET 2000; MP PET 2001; Pb. PMT 2002]
A)
Oxide ores done
clear
B)
Sulphide ores done
clear
C)
Chloride ores done
clear
D)
Amalgams done
clear
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question_answer3)
A process used for the concentration of ore is [MP PMT 1990; MP PET 2003]
A)
Froth floatation done
clear
B)
Roasting done
clear
C)
Electrolysis done
clear
D)
Bessemerization done
clear
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question_answer4)
Magnetic separation is used for increasing concentration of the following [MP PET 1990]
A)
Horn silver done
clear
B)
Calcite done
clear
C)
Haematite done
clear
D)
Magnesite done
clear
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question_answer5)
The substance added in water in the froth floatation process is [EAMCET 1980]
A)
Soap powder done
clear
B)
Pine oil done
clear
C)
Coconut oil done
clear
D)
None of the above done
clear
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question_answer6)
For which ore of the metal, froth floatation method is used for concentration [MP PMT 2001]
A)
Horn silver done
clear
B)
Bauxite done
clear
C)
Cinnabar done
clear
D)
Haematite done
clear
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question_answer7)
Cyanide process is used in the extraction of [DCE 2002, 03]
A)
\[Au\] done
clear
B)
Ag done
clear
C)
both a and b done
clear
D)
Cu done
clear
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question_answer8)
Cassiterite is concentrated by [EAMCET 1998]
A)
Levigation done
clear
B)
Electromagnetic separation done
clear
C)
Floatation done
clear
D)
Liquifaction done
clear
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question_answer9)
Froth floatation process for the concentration of ores is an illustration of the practical application of [NCERT 1984]
A)
Adsorption done
clear
B)
Absorption done
clear
C)
Coagulation done
clear
D)
Sedimentation done
clear
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question_answer10)
Iron ore is concentrated by [MP PMT 1991]
A)
Froth floatation done
clear
B)
Electrolysis done
clear
C)
Roasting done
clear
D)
Magnetic treatment done
clear
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question_answer11)
An ore of tin containing \[FeCr{{O}_{4}}\] is concentrated by [SCRA 1991]
A)
Magnetic separation done
clear
B)
Froth floatation done
clear
C)
Electrostatic method done
clear
D)
Gravity separation done
clear
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question_answer12)
One of the following metals forms a volatile compound and this property is taken advantage for its extraction. This metal is [NCERT 1984]
A)
Iron done
clear
B)
Nickel done
clear
C)
Cobalt done
clear
D)
Tungsten done
clear
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question_answer13)
Bauxite ore is concentrated by [MP PET 1994; KCET 1999; UPSEAT 2001]
A)
Froth flotation done
clear
B)
Electromagnetic separation done
clear
C)
Chemical separation done
clear
D)
Hydraulic separation done
clear
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question_answer14)
In extraction of copper, we use [CPMT 1980; MP PMT 1986]
A)
\[C{{u}_{2}}S\] done
clear
B)
Pyrites done
clear
C)
Silver argent cyanide done
clear
D)
\[CuFe{{S}_{2}}\] done
clear
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question_answer15)
Which metal is most difficult to be extracted from its oxide
A)
\[Cs\] done
clear
B)
\[Ag\] done
clear
C)
\[Zn\] done
clear
D)
\[Mg\] done
clear
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question_answer16)
Copper pyrites are concentrated by [MNR 1995; UPSEAT 1999; AMU 1999; MP PMT 2003]
A)
Electromagnetic method done
clear
B)
Gravity method done
clear
C)
Froth floatation process done
clear
D)
All the above methods done
clear
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question_answer17)
In the metallurgy of zinc, flux is not used because
A)
Zinc ore has no impurities done
clear
B)
Zinc is volatile hence easily separated done
clear
C)
Zinc reacts with flux done
clear
D)
Flux is volatile done
clear
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question_answer18)
Ores like magnetite or tungstates in tin ores are concentrated by
A)
Froth floatation done
clear
B)
Magnetic separation done
clear
C)
Gravity separation done
clear
D)
Electrostatic separation done
clear
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question_answer19)
Froth-floatation method is successful in separating impurities from ores because [Kerala CET 2005]
A)
The pure ore is lighter than water containing additives like pine oil, cresylic acid etc. done
clear
B)
The pure ore is soluble in water containing additives like pine oil, cresylic acid etc. done
clear
C)
The impurities are soluble in water containing additives like pine oil, cresylic acid etc. done
clear
D)
The pure ore is not as easily wetted by water as by pine oil, cresylic acid etc done
clear
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question_answer20)
An ore like zinc blende is concentrated by [MP PMT 1997]
A)
Froth floatation done
clear
B)
Magnetic separation done
clear
C)
Leaching done
clear
D)
Washing with water done
clear
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question_answer21)
The method of concentrating the ore which makes use of the difference in density between ore and impurities is called [Pune CET 1998]
A)
Levigation done
clear
B)
Leaching done
clear
C)
Magnetic separation done
clear
D)
Liquifaction done
clear
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question_answer22)
Which of the following ore is best concentrated by froth-flotation method [AIEEE 2004]
A)
Galena done
clear
B)
Cassiterite done
clear
C)
Magnetite done
clear
D)
Malachite done
clear
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