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: 5

Explanation: A colloidal system is a mixture in which one substance is dispersed in another substance in the form of small particles. The substance that is dispersed is called the dispersed phase, and the substance in which it is dispersed is called the dispersion medium. Out of the given options, the following colloidal systems have a liquid as the dispersion medium:
1. Paints: Paints are a colloidal system in which pigment particles are dispersed in a liquid medium, such as water or oil.
2. Milk: Milk is a colloidal system in which fat globules are dispersed in water.
3. Hair cream: Hair cream is a colloidal system in which oil droplets are dispersed in a water-based emulsion.
4. Froth: Froth is a colloidal system in which gas bubbles are dispersed in a liquid, such as soap solution. 5. Soap lather: Soap lather is a colloidal system in which gas bubbles are dispersed in a liquid, such as water.

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