Question

Which of the following ores is subjected to roasting during metallurgical operations to get the metal oxide?
(A) Zincite
(B) Zinc blend
(C) Malachite
(D) Limonite

Answer 1

Hint: In the metallurgical process of roasting, ore is heated below its melting point in the presence of excess air and converted into its oxide. Sulphide-based roasting is a major source of air pollution, and it has the further disadvantage of releasing great amounts of acidic, poisonous, and metallic chemicals into the environment. Roasting is an exothermic process.

Complete Step by Step Answer:
Zinc blende is subjected to roasting during metallurgical operations for getting the metal oxide. Roasting is carried out to ensure that the desired chemical reaction begins slowly, continues for a sufficient amount of time to transform enough of the product's chemicals into the desirable material, and then ends. The formula for zinc blend is $ZnS$. It is converted into zinc oxide by the metallurgical process of roasting.

Correct Option: (B) Zinc blend.

Additional Information: The process of roasting has many advantages. The substances that have been roasted can easily be powdered. It is a very quick method and requires very little fat. The content of moisture in the substances that have been roasted, gets reduced.

Note: The formula for zincite ore is$ZnO$, which is an oxide ore. The formula for malachite ore is $Cu{{(OH)}_{2}}Cu{{(CO)}_{3}}$, which is a carbonate ore. The formula for limonite ore is $FeO(OH).n{{H}_{2}}O$ , which is a mixture of hydrated iron oxide-hydroxides. These ores cannot undergo the metallurgical process of roasting to get converted into ores.