Principles Related to Practical Chemistry: Chemistry | JEE Main
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.
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Hint 1 of 2
Which colloids from the given list are types of sols, emulsions, or liquid foams (i.e., having a liquid dispersion medium)?
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Correct answer
There are 5 colloidal systems with a liquid dispersion medium: paints, milk, hair cream, froth, and soap lather.
Option analysis
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Solution
StepWorking
01given
List of 9 colloidal systems: Gem stones, paints, smoke, cheese, milk, hair cream, insecticide sprays, froth, soap lather.
02find
Total number of systems where the dispersion medium is a liquid.
Count the systems with dispersion medium as 'Liquid':
- Paints (Sol)
- Milk (Emulsion)
- Hair cream (Emulsion)
- Froth (Foam)
- Soap lather (Foam)
Total count = 5.
✓verify
Verify the non-liquid medium systems:
- Gem stones (Solid)
- Smoke (Gas)
- Cheese (Solid)
- Insecticide sprays (Gas)
Total excluded = 4. 4 + 5 = 9 total systems. Verified.
Hints that build this answer step by step
Which colloids from the given list are types of sols, emulsions, or liquid foams (i.e., having a liquid dispersion medium)?