Question

Parke’s process is also called:
A) Softening process
B) Desilverisation method
C) Cupellation
D) None of these

Answer 1

Hint:Parke’s process is a silver mining process that means extraction of silver from zinc. So, we can easily conclude the answer. But we should know the detailed process and should also know the origin of this process to solve further similar solutions.


Complete answer:
Parke’s process: The mining of Silver started somewhere in the range of 5,000 and 6,000 years prior in Anatolia, or what is currently cutting edge Turkey. As ahead of schedule as 700 B.C., early Mediterranean civic establishments were utilizing the splendid white metal as cash. Throughout the following a few centuries, the focal point of Silver mining moved from Greece to Spain to Germany to Eastern Europe.
In India, Hindustan Zinc is the solitary huge maker of essential Silver, delivering over 95% of Silver. Parke’s measure (licensed in 1850), includes adding Zinc to Lead and softening the two together. At the point when mixed, the liquid Zinc responds, and shapes mixes with any Silver and Gold present in the Lead. These Zinc mixes are lighter than the lead and, on cooling, structure a hull that can be promptly eliminated.
There have been numerous methods of separating Silver through the refining cycle. One of them has been the Parke’s Process, a pyro metallurgical modern cycle for eliminating Silver from Lead during the creation of bullion. It is an illustration of fluid extraction. The cycle exploits two-fluid state properties of Zinc – the First is that Zinc is immiscible with Lead and the Second that Silver is multiple times more dissolvable in Zinc than it is in Lead. At the point when Zinc is added to fluid Lead that contains Silver as a pollutant, the Silver especially moves into the Zinc. Since Zinc is immiscible in Lead, it stays in a different layer and is handily taken out. The Zinc-Silver arrangement is then warmed until the Zinc disintegrates, leaving almost unadulterated Silver. On the off chance that Gold is available in the fluid Lead, it can likewise be eliminated and secluded by a similar cycle.
Parke’s process is also called desilverisation method as it is a process of extracting silver from zinc.

So,the correct option is B.


Note:This process has not been adopted by the U.S. And the reason behind this is the low production of lead in that country. But now those problems are solved and this process is used worldwide for the extraction of silver from zinc.