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Which of the following is an example of a colloid?
Salt solution
Muddy water
Milk
Copper sulphate solution
Milk
Milk is a colloid, specifically an emulsion, where liquid fat globules are dispersed in an aqueous medium. Unlike true solutions, colloids have particle sizes between 1 nm and 1000 nm, making them stable mixtures that do not settle upon standing.
Milk is a colloid, specifically an emulsion, where liquid fat globules are dispersed in an aqueous medium. Unlike true solutions, colloids have particle sizes between 1 nm and 1000 nm, making them stable mixtures that do not settle upon standing.
Think of milk like a crowd of people in a room; even if they move around, they don't 'settle' to the bottom like sand (suspension), but they aren't invisible and individual like single sugar molecules (solution).
SOL-COL-SUS: Solution (small), Colloid (can be seen with Tyndall), Suspension (settles).
1┬аnm<particle┬аsize<1000┬аnm тАФ range of particle diameter for colloids
The stability of milk as a colloid is maintained by emulsifiers like proteins (casein), which prevent the dispersed fat droplets from coalescing. Colloids exhibit the Tyndall effect, where light is scattered by the dispersed phase particles, distinguishing them from homogeneous true solutions.
Colloids are heterogeneous in nature despite appearing homogeneous to the naked eye.
The dispersed phase and dispersion medium determine the type of colloid.
Colloids cannot be separated by ordinary filtration.
High surface area for chemical interaction
Stability of mixture prevents sedimentation
Cannot be easily separated into components compared to simple mixtures
Food industry (emulsions like butter and milk)
Pharmaceuticals (creams and lotions)
| Feature | True Solution | Colloid |
|---|---|---|
Particle Size | Less than 1 nm | 1 nm to 1000 nm |
Salt and Copper Sulphate solutions form true, homogeneous solutions.
Muddy water acts as a suspension where particles eventually settle due to gravity.
C is correct тАФ Milk is a stable colloidal dispersion of butterfat globules within a water-based fluid.
Always remember that if a mixture passes light without scattering (no visible beam), it is a true solution; if it scatters light, it is a colloid or suspension.