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GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF METALS
MCQ TYPE QUESTIONS
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Zone refining can be used to obtain
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Pure Cu
Zirconium
Ultrapure Si
Nickel
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The principle involved in leaching is
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Difference in volatility
Difference in solubility
Difference in density
Soluble complex formation.
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An ore after concentration was found to have basic impurities .The flux which can be used is
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CaCO3
SiO2
FeO
Ca(OH)2
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Choose the correct statement
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a .All minerals are ores
b. All ores are minerals
c.Both a and b
Minerals are not ores.
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An ore contains PbS with impurity ZnS.NaCN is added during the froth floataion process in this and ZnS does not form the froth because
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NaCN forms a complex with ZnS
ZnS is not wetted by pine oil
ZnS is wetted by water
NaCN reacts with ZnS to form a ionic compound
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Heating of ore in presence of oxygen below its melting point is known as
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Roasting
Calcination
Smelting
None of the above
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In hall heroult's process cryolite is added to alumina to
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a.Increase the conductivity
b.Lower the melting point of alumina
both a and b
None of the above
Other:
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Liquation
vapour phase refining
Distillation
Zone refining
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Name the metal purified by Mond's process
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Zr
Ti
Ni
Ge
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in electrolytic refining of copper, anode mud contains
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Earthly impurities
Zn and Mn
Noble metals
Oxides of copper
Other:
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The principle of zone refining is
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Fractional distillation
Fractional crystallisation
Adsorption
Chromatographic separation
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