Which of the following statements are correct in connection with the extraction of silver?

Options

A. When the lead -silver alloy is rich in lead ,lead is removed by the cupellion process
B. When the lead -silver alloy is rich in lead ,lead is removed by park,e or pattinsion ,s process
C. Zinc forms ann alloy with lead ,g=from which lead is separated by distillation
D. Zinc forms an alloy with silver ,from which zinc is sepatated by distillation

Answer

3