Question

Which of the following statements are correct:

I : Zinc and lead are immiscible in molten state; zinc is lighter than lead.

II : Solubility of silver in molten zinc is higher than that in molten lead.

II : Zinc is volatile.

• A. I and II only
• B. II and III only
• C. I and III only
• D. I, II and III

Answer 1

The correct option is D I, II and III

All metals can be converted into vapour if they are heated to a sufficiently high temperature. A number of metals, however, are readily volatilized even by relatively moderate heat, such metals being known as the "volatile metals." They are mercury, cadmium, sodium, potassium, arsenic and zinc.

In the molten state, the density of two metals are different, hence, both are immiscible.

The mineral containing silver and lead is melted, and molten zinc is added. Ag is distributed between zinc and lead layers (zinc being lighter forms upper layer). Since the solubility of Ag in molten zinc is higher than in molten lead, hence, most of the silver goes from lead layer to zinc layer. Two layers are separated. Ag containing zinc layer is distilled when zinc separates leaving behind silver.

All are correct.