Question

The liquation method is used for the purification of -

• A. Copper
• B. Iron
• C. Aluminium
• D. Lead

Answer 1

The correct option is D

Lead

The explanation for the correct option:

Option (D): Lead

1. The metallurgical process of liquidation is used to remove metals from an ore, metal, or alloy.
2. This is done by heating the substance until one of the constituents begins to melt while the other remains solid. The liquid melt is drained and collected from the other.
3. The liquation method can be used with metals with especially low melting points, such as Lead, Tin, and Bismuth.
4. Low-boiling-point metals are allowed to flow down a sloped surface, separating them from impurities with higher boiling points.
5. Liquation is similar to distillation, except instead of vaporizing the impure metal, it is melted.
6. Lead has the least melting point among Copper, Iron, and Aluminum.
7. Hence it is the correct option.

The explanation for incorrect option(s):
Option (A): Copper

1. Copper is an element of the fourth period, p block in the periodic table. It is a metal with a high melting point. Therefore, it is not purified in liquation.
2. Hence it is an incorrect option

Option (B): Iron

1. Liquation method purifies metal with a low melting point but iron being a strong metal has a high melting point.
2. Hence, it is an incorrect option.

Option (C): Aluminium

1. Aluminium has a slightly higher melting point than lead Therefore, it is not purified by liquation.
2. Hence, it is an incorrect option.

Therefore, option (D) is the correct answer.