Question

Extraction of silver for an argentiferous lead $\left( {{\text{Pb + Ag}}} \right)$ involves:
A. Distillation method
B. Cupellation
C. Pattinson’s process
D. Parke’s process

Answer 1

Argentiferous lead is a mixture of molten lead and molten silver. Thus, this is a liquid-liquid mixture with different solubilities. Thus, an appropriate process capable of liquid-liquid extraction must be applied.

Complete step by step answer: Let us discuss every method one by one. First of all, let’s begin with Parke's method that is an associate process that involves adding metal to guide and melting the two along. This method is widely used for removing silver from lead throughout the assembly of bullion. It works on the principle of distribution. The method takes advantage of two liquid- state properties of the metal that embrace that metal is immiscible with lead and also the difference is that silver is additional soluble in metal than it's in lead. once the metal is supplemental to liquid lead that contains silver as stuff, the silver preferentially migrates into the metal. The opposite method is Pattison's method that is sometimes adopted for the desilverization of lead. Cupellation could be a method wherever an ores area unit is treated beneath warm temperature. It additionally involves controlled operation to separate noble metals like gold and silver from base metals like lead, copper, zinc, and different presents within the ores or alloyed metal. The Parke’s method wasn't adopted within the US, due to the low native production of lead. So, the right possibility is Parke’s method.
Parke’s process was patented in 1850 and used to remove silver from Argentiferous lead. In this process Zinc is used to obtain silver as it reacts completely with it to form insoluble compounds which can be skimmed off during extraction.
So, the correct answer is “Option A”.

Note:
Liquid-Liquid extraction is a type of extraction technique which is used to separate two compounds or metal complexes on the basis of their solubilities in two different immiscible liquids. This technique is also known as solvent extraction and it is one of the widely used techniques for the extraction of metals.