Question

Select correct statement regarding silver extraction process.
(A) When the lead-silver alloy is rich in silver, lead is removed by the cupellation process.
(B) When the lead-silver alloy is rich in lead, lead is removed by Parker's or Pattinson's process.
(C) Zinc forms an alloy with lead, from which is separated by distillation.
(D) Zinc forms an alloy with silver, from which zinc is separated by distillation.

Answer 1

Hint:In the given question firstly we have to define the process of the silver extraction. Now the lead has been removed by the cupellation process and the Zinc is known to have formed an alloy with silver, from which zinc is separated by distillation. And along with that given impurities including lead, copper, tin, and other unwanted metals, are oxidized and partly vaporized and partly absorbed into the pores of the couple.

Complete step-by-step answer:The given question statement asks about the chemical process which is regarding the process used for the silver extraction process. Among which we have to identify it and give the answer for it by explaining the process with example.
There are many important points to mention in the answer:
-When we say that the lead-silver alloy is rich in silver, the lead has been removed by the cupellation process.
-The given impurities including lead, copper, tin, and other unwanted metals, are oxidized and partly vaporized and partly absorbed into the pores of the couple.
-When the lead-silver alloy is rich in lead, lead is removed by parker's or pattinson's process which includes desilverizing argentiferous lead by repeated meltings and skimmings, which concentrate the silver in the molten bath, the final skimmings being nearly pure lead.
-Zinc is known to have formed an alloy with silver, from which zinc is separated by distillation.
Therefore the right options among the following would be:
Option (A), When the lead-silver alloy is rich in silver, lead is removed by the cupellation process.
Option (B), When the lead-silver alloy is rich in lead, lead is removed by Parker's or Pattinson's process.
Option (D), Zinc forms an alloy with silver, from which zinc is separated by distillation.

Hence,the correct options are (A),(B) &(D).

Note:Silver has been known since ancient times. Silver is mentioned in the Book of Genesis, and slag heaps found in Asia Minor and on the islands of the Aegean Sea indicate that silver was being separated from lead as early as the \[4th\] millennium BC. The silver mines at Laurium were very rich and helped provide a currency for the economy of Ancient Athens.