Size of colloidal clay particle is less than:

✅ Explanation:
Colloidal clay particles are the smallest particles in the soil texture classification system. They are incredibly fine, with a diameter less than 0.0002 mm (or 0.2 micrometers). This extremely small size gives colloidal clay its unique properties, such as high surface area, high cation exchange capacity, and the ability to form stable suspensions in water.

• based on Soil Group, Type of Soil, Sub-group, and Size Range:
-Very Coarse Soils
-Boulder: > 300 mm
-Cobble: 80 – 300 mm
-Coarse Soils
-Gravel
-Coarse: 20 – 80 mm
-Fine: 4.75 – 20 mm
-Sand
-Coarse: 2 – 4.75 mm
-Medium: 0.425 – 2 mm
-Fine: 0.075 – 0.425 mm
-Fine Soils
-Silt: 0.002 – 0.075 mm
-Clay: < 0.002 mm