Question

The reaction in the metallurgical process of zinc is called
$2ZnS+3O_2\rightarrow 2ZnO + 2SO_2$
(A) Roasting
(B) Smelting
(C) Cupellation
(D) Calcination

Answer 1

Hint: Metals are found in nature in the form of some compounds. Minerals are made up of soil, rocks, limestone, sand, and metal complexes. Commercial metals are easily and cheaply extracted from minerals. These minerals are called ores. Metallurgy is the process by which metals are extracted from the ores into their pure form.

Complete Step by Step Answer:
The reaction:
$2ZnS+3O_2\rightarrow 2ZnO + 2SO_2$ in the metallurgical process of zinc is called roasting. $ZnS$ is converted into $ZnO$ in the presence of excess air at $1200K$. In the metallurgical process of roasting, ore is heated below its melting point in a 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. In metallurgical processes, when ores are transformed into oxides and then metals are extracted, roasting is used.

Sulphide ores are typically converted using this method. Volatile chemicals, moisture, and impurities are all eliminated throughout this process.
Correct Option: (A) Roasting.

Note: Base metals are extracted from their ores using heat and a chemical reducing agent. This process is known as smelting. Cupellation is a metallurgical refinement process that uses controlled operations at extremely high temperatures to separate the base metals present in the ore, such as lead, copper, zinc, antimony, and bismuth, from the noble metals, such as gold and silver. Calcination is the process of heating ore to a high temperature and turning it into an oxide. In this process, the ore is heated below the melting point in the presence of little or no air.