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Extraction of Metals

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36 Questions

What is the primary purpose of heating the concentrated ore in the calcination process?

To drive off moisture and volatile impurities

What is the main advantage of the froth floatation process in concentrating sulphide ores?

It takes advantage of the preferential wetting of the ore by an oil

What is the result of blowing a strong current of air through the suspension in the froth floatation process?

A heavy froth or foam is formed on the surface

What is the final step in the froth floatation process?

The froth is skimmed off and the gangue is settled at the bottom

What is the purpose of using pine oil or terpentine oil in the froth floatation process?

To wet the metal sulphide

What is the result of the calcination process on the ore?

The ore becomes more porous

What method of refining is used for metals like copper, silver, gold, zinc, nickel, and chromium?

Electrolytic refining

Which of the following methods is NOT used for the extraction of metals?

-zone refining

Which metal is extracted through the electrolysis of fused CaCl2 and CaF2?

Aluminium

What is the main method of extraction for calcium?

Electrolysis of fused CaCl2 and CaF2

Which method is used for the purification of iron?

Zone refining

What type of metallurgical process is used for the extraction of metals using heat energy?

Pyrometallurgy

What is the purpose of heating the impure metal in a blast of air during cupellation?

To oxidise and remove impurities

What is the role of green wood poles in the poling process?

To form hydrocarbons that reduce metal oxides

What is the purpose of fractional distillation in the metallurgy of zinc?

To separate cadmium from zinc

What is the final product of thermal dissociation of nickel carbonyl?

Pure nickel

What is the role of the electrolyte in the electrolytic refining process?

To enable the smooth deposition of pure metal

What is the common feature of the methods used to purify metals?

Removal of impurities by oxidation or reduction

What is the primary purpose of the liquation process in refining metals?

To remove impurities from the metal

What is the purpose of using mercury in the amalgamation process?

To combine with the metal particles in the ore

What is the result of the amalgamation process?

Formation of an amalgam

Which of the following methods is used for the refinement of metals like copper, silver, gold, zinc, nickel, and chromium?

Electrolytic refining

What is the purpose of the electrolyte in the electrolytic refining process?

To facilitate the flow of ions

What is the result of the electrolytic refining process?

Obtaining the metal in its pure form

What is the primary purpose of the Mond process?

To purify nickel by forming a volatile compound

Which of the following methods is used to purify metals like Si, Ge, and Ga?

Zone refining or fractional crystallisation

What is the characteristic of the volatile compound formed in the Van Arkel process?

It is decomposed electrically

What is the purpose of the movable heater in the zone refining process?

To melt the metal at the point of heating

Which of the following metals can be purified by distillation?

Zinc, mercury, and arsenic

What is the key principle behind the zone refining process?

Difference in solubility of impurities in molten and solid state

What is the primary purpose of zone refining of metals?

To purify the metal by removing impurities

Which of the following metals is not refined electrolytically?

Iron

What is the role of the anode in the electrolytic refining process?

To dissolve the impure metal

What is the purpose of using a suitable electrolytic bath in the electrolytic refining process?

To facilitate the dissolution of the impure metal

What is the common feature of the metals refined electrolytically?

They are all good conductors of electricity

Which of the following is a characteristic of the zone refining process?

It is a method of purification of metals

This quiz covers the chemical methods of ore purification, including calcination and froth floatation process. Learn about the processes involved in removing impurities from ores and converting them into their desired forms.

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