Chromatography Method of Purification of Metals

Chromatography is a widely used method for the purification of metals. It is based on the principle of adsorption, where an adsorbent material is used to separate and purify different components of a mixture. In the chromatography method, the adsorbent is packed into a column, and the mixture is passed through it. The different components of the mixture interact differently with the adsorbent, leading to their separation.

Adsorbents Used in Chromatography Method

In the chromatography method of purification of metals, two commonly used adsorbents are:

1. Alumina (Option A):
Alumina, also known as aluminum oxide (Al2O3), is a widely used adsorbent in chromatography. It has a high surface area and a strong affinity for many metal ions. Alumina can selectively adsorb different metal ions based on their chemical properties, allowing for their separation and purification.

2. Silica Gel (Option C):
Silica gel is another common adsorbent used in chromatography. It is a porous form of silicon dioxide (SiO2) and has a high surface area. Silica gel can selectively adsorb certain metal ions based on their chemical properties, allowing for their separation and purification.

Explanation of the Answer

Option A (Alumina) and Option C (Silica Gel) are the correct answers because both of these adsorbents are commonly used in the chromatography method of purification of metals.

Option B (Slaked Lime) is not the correct answer because slaked lime (calcium hydroxide, Ca(OH)2) is not typically used as an adsorbent in chromatography. It is more commonly used in processes like neutralization and precipitation for the removal of impurities.

Option D (Alum) is not the correct answer because alum (potassium aluminum sulfate, KAl(SO4)2·12H2O) is not an adsorbent. It is a compound used in various applications, including water treatment and as a mordant in dyeing processes.

In summary, the correct adsorbents used in the chromatography method of purification of metals are alumina (Option A) and silica gel (Option C). These adsorbents have high surface areas and selective adsorption properties, allowing for the separation and purification of different metal ions.