Question

Grass stain can be removed by using :

• A. Potassium Permanganate
• B. Borax
• C. Methylated Spirit
• D. Oxalic Acid

Hint:

Because chlorophyll (the pigment in grass) is an organic compound soluble in alcohol, "Methylated Spirit" or rubbing alcohol is the most effective solvent to dissolve and remove grass stains.

Answer 1

The Correct Option is C

Step 1: Understanding the Concept:
Stain removal in laundering is based on chemical solubility.
A stain is best removed using a solvent that dissolves its specific coloring matter without damaging the underlying fabric fibers.

Step 2: Detailed Explanation:
Let us analyze the chemical properties of grass stains:
- Grass stains are primarily composed of chlorophyll, a green plant pigment.
- Chlorophyll is a fat-soluble pigment that is highly soluble in organic solvents like alcohol, but insoluble in water.
- Methylated Spirit (denatured alcohol): This organic solvent acts on the chlorophyll molecules, dissolving them and lifting the pigment from the textile fibers.
Let us evaluate why other options are less suitable:
- Potassium Permanganate: A powerful oxidizing bleach that can damage delicate fibers and cause yellow staining on white fabrics if not neutralized, and is not a direct solvent for chlorophyll.
- Borax: A mild alkaline bleach and water softener, useful for protein stains but ineffective at dissolving chlorophyll.
- Oxalic Acid: An acidic stain remover used primarily for iron rust or ink stains, not for plant pigments.
Therefore, methylated spirit is the correct agent.

Step 3: Final Answer:
Grass stains can be effectively removed from fabrics using Methylated spirit.