Question

The number of colloidal systems from the following, which will have 'liquid' as the dispersion medium, is____.
Gem stones, paints, smoke, cheese, milk, hair cream, insecticide sprays, froth, soap lather.

Answer 1

Correct Answer: 5

Colloidal Systems with Liquid Dispersion Medium Analysis 

A colloid is a mixture where one substance is dispersed evenly throughout another. The substance being dispersed is the dispersed phase, and the substance it is dispersed in is the dispersion medium. We are looking for colloidal systems where the dispersion medium is a liquid.

• Paints: Pigment particles are dispersed in a liquid medium (oil or water-based).
• Milk: Fat globules and protein particles are dispersed in water.
• Hair cream: Various ingredients are dispersed in a liquid base.
• Froth: A gas is dispersed in liquid.
• Soap lather: A gas is dispersed in a liquid (soap solution).

The following are not liquid-based colloids:

• Gem stones: These are solid solutions, not colloids.
• Smoke: Solid particles dispersed in a gas (air).
• Cheese: A complex mixture with a solid matrix.
• Insecticide sprays: Liquid dispersed in gas.

Conclusion:

Therefore, the colloidal systems with a liquid dispersion medium are paints, milk, hair cream, froth, and soap lather. There are 5 such systems.

Answer 2

Liquid dispersion medium colloidal systems include paints, milk, hair cream, froth, soap lather. Thus, there are 5 such systems.