ANS:B - Alumina

Fuller's earth is commonly used to decolorize yellow glycerine. Here's why:

• Fuller's earth is a type of clay that is rich in minerals like montmorillonite. It has a high adsorption capacity for various impurities, including colorants and pigments.
• When yellow glycerine is passed through a bed of Fuller's earth, the clay particles adsorb the colored impurities, leaving behind a clearer, colorless glycerine product.
• This process is commonly employed in the refining of glycerine to remove colorants and improve its purity for various industrial applications.