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HCS (Haryana)Prelims2026General Studies
Question
Consider the following information: Column-A | Column-B | Column-C 1. Smoke | Colloid | Gas in solid 2. Milk | Emulsion | Homogeneous 3. Pumice stone | Foam | Heterogeneous In how many of the above rows is the given information correctly matched?
Options
- A Only one
- B Only two
- C All three
- D None
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Correct Answer
A Only one
Model Answer
- Smoke is a colloid in which the dispersed phase is a solid and the dispersion medium is a gas, that is, it is a solid in gas (aerosol) and not a gas in solid. Hence, row 1 is not correctly matched.
- Milk is an emulsion of liquid fat dispersed in water, but all colloidal solutions are heterogeneous in nature, since the dispersed phase and the dispersion medium constitute two separate phases even though they appear homogeneous to the naked eye. Hence, row 2 is not correctly matched.
- Pumice stone is a foam in which a gas is dispersed in a solid, and like all colloids it is heterogeneous. Hence, row 3 is correctly matched.
- Colloids show the Tyndall effect, that is, they scatter a beam of light passing through them.
- Therefore, only one row is correctly matched.