Solution: Both I and III -
I. The soap molecules form structures called micelles.
This is correct. Soap molecules have a hydrophilic (water-loving) head and a hydrophobic (water-hating) tail. In water, they arrange themselves into spherical structures called micelles with the hydrophobic tails pointing inwards.
II. Soap micelles cannot scatter light.
This is incorrect. Soap micelles are colloidal particles and are large enough to scatter light, which is why soap solutions often appear cloudy.
III. Oily dirt gets collected in the center of the micelle.
This is correct. The hydrophobic tails of the soap molecules are attracted to the oily dirt, trapping it in the center of the micelle, allowing it to be washed away with water.
