Extraction of Metals

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

To melt the ore

To drive off moisture and volatile impurities (correct)

To mix the ore with air

To convert oxides into carbonates

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

It uses electromagnetic forces to separate the ore

It takes advantage of the preferential wetting of the ore by an oil (correct)

It uses centrifugal separation to separate the ore

It uses gravity to separate the ore

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

The ore is mixed with the oil

A heavy froth or foam is formed on the surface (correct)

The gangue is carried to the surface

The ore settles at the bottom of the tank

What is the final step in the froth floatation process?

The froth is skimmed off and the gangue is settled at the bottom Signup and view all the answers

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

To wet the metal sulphide Signup and view all the answers

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

The ore becomes more porous Signup and view all the answers

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

Electrolytic refining Signup and view all the answers

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

-zone refining Signup and view all the answers

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

Aluminium Signup and view all the answers

What is the main method of extraction for calcium?

Electrolysis of fused CaCl2 and CaF2 Signup and view all the answers

Which method is used for the purification of iron?

Zone refining Signup and view all the answers

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

Pyrometallurgy Signup and view all the answers

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

To oxidise and remove impurities Signup and view all the answers

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

To form hydrocarbons that reduce metal oxides Signup and view all the answers

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

To separate cadmium from zinc Signup and view all the answers

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

Pure nickel Signup and view all the answers

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

To enable the smooth deposition of pure metal Signup and view all the answers

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

Removal of impurities by oxidation or reduction Signup and view all the answers

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

To remove impurities from the metal Signup and view all the answers

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

To combine with the metal particles in the ore Signup and view all the answers

What is the result of the amalgamation process?

Formation of an amalgam Signup and view all the answers

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

Electrolytic refining Signup and view all the answers

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

To facilitate the flow of ions Signup and view all the answers

What is the result of the electrolytic refining process?

Obtaining the metal in its pure form Signup and view all the answers

What is the primary purpose of the Mond process?

To purify nickel by forming a volatile compound Signup and view all the answers

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

Zone refining or fractional crystallisation Signup and view all the answers

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

It is decomposed electrically Signup and view all the answers

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

To melt the metal at the point of heating Signup and view all the answers

Which of the following metals can be purified by distillation?

Zinc, mercury, and arsenic Signup and view all the answers

What is the key principle behind the zone refining process?

Difference in solubility of impurities in molten and solid state Signup and view all the answers

What is the primary purpose of zone refining of metals?

To purify the metal by removing impurities Signup and view all the answers

Which of the following metals is not refined electrolytically?

Iron Signup and view all the answers

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

To dissolve the impure metal Signup and view all the answers

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

To facilitate the dissolution of the impure metal Signup and view all the answers

What is the common feature of the metals refined electrolytically?

They are all good conductors of electricity Signup and view all the answers

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

It is a method of purification of metals Signup and view all the answers