Question

Which method is not correct given for refining of crude metals?
A. Distillation : Zinc and mercury
B. Liquation : Tin
C. Van Arkel : Zirconium
D. Mond process : Lead

Answer 1

One of the following options is used for the refining of nickel and then nickel gets heated with carbon monoxide to form highly volatile nickel tetracarbonyl. Later it is decomposed to pure nickel at high temperature.

Complete step-by-step answer: Mond process is the one which is used for the refining of nickel.
Nickel is then heated with carbon monoxide to produce highly volatile nickel tetracarbonyl.
Later it is decomposed to pure nickel at high temperature.
The Mond process, also called the carbonyl process, is a technique formed by Ludwig Mond in 1890, just to extract and purify the nickel. This process includes the fact that carbon monoxide combines with nickel heavily and reversibly to form nickel carbonyl.

Additional Information:
Distillation is the process of differentiating components of a mixture depending on various boiling points. Examples of distillation involve purification of alcohol, desalination, crude oil refining, and forming liquefied gases from air. Humans have been using the process of distillation since at least 3000 BC in the Indus valley.
Liquation can be termed as a metallurgical method for separating metals from an ore or alloy. The material needs to be heated until one of the metals starts to melt and gets drained away from the other end and can be collected.
The Van Arkel method is actually used for refining Zirconium or Titanium. In this method, generally oxygen and nitrogen are present as an impurity which is removed by heating metal in an evacuated vessel along with iodine. The metal iodide produced is volatile and volatile metal iodide is further decomposed on a tungsten filament when heated to around 1800K.
The Mond process, also called the carbonyl process, is a technique formed by Ludwig Mond in 1890, just to extract and purify the nickel. This process includes the fact that carbon monoxide combines with nickel heavily and reversibly to form nickel carbonyl.

Hence, Option D) Mond process : Lead is correct.

Note: Mond process is the one which is used for the refining of nickel among all the options given. This process involves the fact that carbon monoxide combines with nickel heavily and reversibly to form nickel carbonyl.