During cooking, if water and mustard oil are mixed, oil floats on the top of water because:

Correct option is C

The correct option is (C) The density of mustard oil is lesser than water.

Explanation:
Mustard oil floats on top of water because oil is less dense than water. Density is the mass per unit volume of a substance, and substances with lower density float on substances with higher density. Since mustard oil is immiscible in water, it does not mix with water, and the difference in their densities causes the oil to stay on top.

Information Booster:

• Density of water is around 1 g/cm³, while the density of mustard oil is lower at approximately 0.91 g/cm³.

• Immiscibility of liquids like water and mustard oil occurs due to differences in their molecular structure and polarity.

• This property of floating due to density differences is commonly seen in other oil-water mixtures.

• This principle is also applied in various oil-water separation techniques in both natural and industrial processes.

Additional Knowledge:

Mustard Oil:

• Mustard oil is a common cooking oil in India and is known for its distinct aroma and high smoking point.

Water:

• Water, being a polar molecule, has high surface tension and density, making it a good solvent for many substances.

Miscibility:

• Immiscible liquids like oil and water form separate layers due to their inability to mix, influenced by differences in polarity and intermolecular forces.