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Which of the following statements are correct? 1. Colloids appear homogeneous because their particles are very small. 2. Colloids are truly homogeneous at the molecular level. 3. Colloidal particles scatter light. 4. Milk is a colloidal solution.
2 and 4 only
1, 2, 3 and 4
1 and 2 only
1, 3 and 4 only
1, 3 and 4 only
Colloids are heterogeneous mixtures that appear homogeneous to the naked eye because their particles are too small to be seen individually. While they exhibit properties of heterogeneous mixtures, such as the Tyndall effect, they are not homogeneous at the molecular level as they consist of a dispersed phase and a dispersion medium.
Colloids are heterogeneous mixtures that appear homogeneous to the naked eye because their particles are too small to be seen individually. While they exhibit properties of heterogeneous mixtures, such as the Tyndall effect, they are not homogeneous at the molecular level as they consist of a dispersed phase and a dispersion medium.
Think of a room filled with smoke; the air looks clear (homogeneous appearance), but if you shine a flashlight through it, the light path becomes visible due to the scattered dust and smoke particles.
CTSC: Colloids, Tyndall, Scatter, Complex (Heterogeneous).
1┬аnmтЙдparticle┬аsizeтЙд1000┬аnm тАФ the typical size range of colloidal particles.
The Tyndall effect occurs because colloidal particles have a size range (1┬аnm to 1000┬аnm), which allows them to scatter light beams passing through the medium. Since the particles are larger than molecules in a true solution but smaller than particles in a suspension, they remain stable and do not settle under gravity.
Colloids are heterogeneous mixtures, not homogeneous.
The Tyndall effect is a diagnostic property of colloids.
Milk consists of fat globules dispersed in water, making it an emulsion (a type of colloid).
Colloids do not settle on keeping, unlike suspensions.
High surface area for adsorption.
Stability of the colloidal system prevents sedimentation.
Difficult to separate dispersed phase using simple filtration.
Milk and dairy products.
Medicines (syrups and emulsions).
Option 2 is incorrect because colloids are technically heterogeneous, characterized by the existence of a phase boundary at the microscopic level.
The Tyndall effect is proportional to the number and size of particles.
Brownian motion, a constant random movement of particles, keeps colloidal particles suspended.
D is correct тАФ Statements 1, 3, and 4 are scientifically accurate characteristics of colloidal systems.
Always remember that visibility of the path of light (Tyndall effect) is the easiest way to distinguish a colloid from a true solution in exams.