Colloids — Flashcards
NIOS · Class 12 · Chemistry
40 flashcards for Colloids (NIOS Class 12 Chemistry) to test yourself on key terms and facts. Sample: "What is the size range of particles"
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What is the size range of particles in a colloidal solution?
Answer
The size of particles in a colloidal solution ranges between 1 nm and 100 nm (1-100 nm). This intermediate size distinguishes colloids from true solutions (< 1 nm) and suspensions (> 100 nm). For exam…
Distinguish between true solution, colloidal solution, and suspension based on particle size and filterability.
Answer
True Solution: particles < 1 nm, passes through ordinary filter paper and animal membrane, particles invisible to microscope. Colloidal Solution: particles 1-100 nm, passes through filter paper but no…
Define dispersed phase and dispersion medium in a colloidal solution. Give an example.
Answer
Dispersed Phase: The substance present in small proportion with particles of colloidal size (1-100 nm). Dispersion Medium: The medium in which colloidal particles are dispersed. Example: In colloidal …
List and give examples of all eight types of colloidal solutions based on the physical state of dispersed phase and dispersion medium.
Answer
1. Solid-Solid (Solid Sol): Gemstones. 2. Solid-Liquid (Sol): Paints, gold sol, starch sol. 3. Solid-Gas (Aerosol): Smoke, dust in air. 4. Liquid-Solid (Gel): Jelly, cheese. 5. Liquid-Liquid (Emulsion…
What is the difference between hydrosol and alcohol sol?
Answer
Hydrosol: A colloidal solution where the dispersion medium is water. Example: gold sol in water, starch sol in water. Alcohol Sol: A colloidal solution where the dispersion medium is alcohol. Example:…
Define lyophilic colloids and explain why they are easily prepared.
Answer
Lyophilic (solvent-loving) colloids are those where the dispersed phase has great affinity for the dispersion medium. They are easily prepared by directly mixing the dispersed phase with the dispersio…
What are lyophobic colloids? Why must they be prepared by special methods?
Answer
Lyophobic (solvent-hating) colloids are those where the dispersed phase has no affinity for the dispersion medium. Examples: Au, Ag, metal hydroxides, metal sulfides. They must be prepared by special …
Explain macromolecular colloids with an example.
Answer
Macromolecular colloids are those where the size of individual particles of the dispersed phase is large enough to fall within the colloidal dimension (1-100 nm). The molecules themselves are naturall…
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