Colloids — Flashcards
Telangana Open School (TOSS) · Class 12 · Chemistry
30 flashcards for Colloids (Telangana Open School (TOSS) Class 12 Chemistry) to test yourself on key terms and facts.
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What is the size range of particles in a colloidal solution?
Answer
The size of colloidal particles ranges from 1 nm to 100 nm. This is intermediate between true solutions (<1 nm) and suspensions (>100 nm).
Differentiate between true solution, colloidal solution, and suspension based on particle size.
Answer
• True solution: Particle size < 1 nm<br>• Colloidal solution: Particle size 1–100 nm<br>• Suspension: Particle size > 100 nm…
Why do colloidal particles not settle down on standing?
Answer
Colloidal particles remain suspended due to constant Brownian motion and electrostatic repulsion caused by similar charges on particles, preventing aggregation and settling.
Define dispersed phase and dispersion medium with an example.
Answer
• Dispersed phase: The substance present in small amount as colloidal particles (e.g., sulfur in sulfur sol)<br>• Dispersion medium: The medium in which particles are dispersed (e.g., water in sulfur …
Give one example each of: (a) Sol (b) Gel (c) Emulsion (d) Aerosol
Answer
• (a) Sol: Gold sol<br>• (b) Gel: Jelly<br>• (c) Emulsion: Milk<br>• (d) Aerosol: Fog…
What is a hydrosol? How is it different from an alcosol?
Answer
• Hydrosol: A colloidal solution where water is the dispersion medium (e.g., starch sol in water)<br>• Alcosol: A colloidal solution where alcohol is the dispersion medium (e.g., cellulose nitrate in …
Classify the following: Milk, sugar in water, clay in water, blood, boot polish, sand in water, face cream, jelly, foam.
Answer
• True solution: Sugar in water<br>• Colloidal solution: Milk, blood, boot polish, face cream, jelly, foam<br>• Suspension: Clay in water, sand in water…
What is the difference between lyophilic and lyophobic colloids?
Answer
• Lyophilic: Dispersed phase has strong affinity for dispersion medium (e.g., starch in water). Reversible and stable.<br>• Lyophobic: No affinity between phases (e.g., gold sol). Require special meth…
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