Question

$(Ag+Pb{)}_{alloy}\underset{\text{zinc is added}}{\overset{\text{melt}}{\to }}(Ag+Pb+Zn{)}_{melt}\stackrel{cool}{⟶}\frac{LayerX}{LayerY}$
Select correct statement based on above scheme.

• A. Layer X contains Zinc and silver
• B. Layer Y contains lead and silver but amount of silver in this layer is smaller than in the layer X.
• C. X and Y are immiscible layers
• D. all of the above are correct statements

Answer 1

The correct option is D all of the above are correct statements

This is Parkes process for the extraction of silver from argentiferrous lead.
It is based on following facts.

(i) Molten zinc and lead are immiscible. Zinc forms upper layer as it is lighter.

(ii) Silver is more soluble in molten Zn than in molten lead.

Hence, Layer X contains Zinc and silver.
Thus, the option A is correct.