1. Gelatin forms which type of colloidal system when dispersed in water?
A.
Lyophilic colloid
B.
Lyophobic colloid
C.
Suspension
D.
True solution
Correct Answer:
Lyophilic colloid
Explanation:
Gelatin has a strong affinity for water and forms a lyophilic colloid in water.
2. Gelatin is classified as a macromolecular colloid because its particles are made up of:
A.
Small inorganic ions
B.
Large molecules
C.
Metal atoms only
D.
Simple salts
Correct Answer:
Large molecules
Explanation:
Gelatin consists of very large protein molecules, so its colloidal particles are macromolecules.
3. What is the main interaction between gelatin and water in a gelatin colloid?
A.
Strong attraction
B.
Complete repulsion
C.
No interaction
D.
Chemical combustion
Correct Answer:
Strong attraction
Explanation:
Gelatin is hydrophilic and attracts water molecules strongly, allowing it to form a stable colloidal dispersion.
4. Gelatin is commonly used as a protective colloid because it can:
A.
Prevent coagulation of another colloid
B.
Convert all colloids into crystals
C.
Remove water from every solution
D.
Produce only true solutions
Correct Answer:
Prevent coagulation of another colloid
Explanation:
Gelatin can protect dispersed particles by forming a hydrated layer around them and reducing their coagulation.
5. Which property is characteristic of a gelatin colloid?
A.
Reversible hydration
B.
Permanent insolubility in water
C.
Absence of affinity for water
D.
Formation of only gaseous particles
Correct Answer:
Reversible hydration
Explanation:
Gelatin can absorb water and swell, and this hydration behavior is characteristic of its lyophilic colloidal nature.
6. When gelatin is mixed with water, it generally undergoes:
A.
Swelling and hydration
B.
Immediate evaporation
C.
Metallic deposition
D.
Complete decomposition into ions
Correct Answer:
Swelling and hydration
Explanation:
Gelatin absorbs water, swells, and becomes hydrated because of its affinity for the dispersion medium.
7. The stability of a gelatin colloid is mainly due to:
A.
Hydration of gelatin molecules
B.
Absence of water molecules
C.
Formation of metal crystals
D.
Rapid sedimentation
Correct Answer:
Hydration of gelatin molecules
Explanation:
Water molecules surround and hydrate gelatin particles, helping to keep them dispersed and stable.
8. Gelatin is an example of which type of macromolecular colloid?
A.
Natural macromolecular colloid
B.
Metallic aerosol
C.
Synthetic emulsion only
D.
Inorganic suspension
Correct Answer:
Natural macromolecular colloid
Explanation:
Gelatin is obtained from a natural protein source and forms a colloid because of its large molecular size.
9. Which substance can act as a protective colloid for a colloidal system?
A.
Gelatin
B.
Sodium chloride crystal
C.
Sand grain
D.
Copper wire
Correct Answer:
Gelatin
Explanation:
Gelatin is a lyophilic macromolecular colloid and is widely used to protect other colloids from coagulation.
10. Why does gelatin readily form a colloid in water?
A.
Its large molecules disperse and become hydrated
B.
It reacts violently with water
C.
It forms metallic particles in water
D.
It remains completely separate from water
Correct Answer:
Its large molecules disperse and become hydrated
Explanation:
Gelatin molecules are large enough to form colloidal particles and have sufficient affinity for water to become hydrated and dispersed.
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