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 lead is separated by distillation.
• D. Zinc forms an alloy with silver, from which zinc is separated by distillation.

Answer 1

Answer: (A), (B), (D)

Zinc forms an alloy with silver, from which zinc is separated by distillation.
When the lead-silver alloy is rich in silver, lead is removed by the cupellation process.
When the lead-silver alloy is rich in lead, lead is removed by parker's or pattinson's process.

When the lead-silver alloy is rich in silver, lead is removed by the cupellation process. The impurities, including lead, copper, tin, and other unwanted metals, are oxidized and partly vaporized and partly absorbed into the pores of the cupel. 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 forms an alloy with silver, from which zinc is separated by distillation.