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Which of the following is true?
Animal hides are colloidal in nature.
Addition of alum to water makes it unfit for drinking.
Latex is not a colloidal solution.
All of the above.
Answers (1)
Applications of Colloids
1. Purification of Drinking water: Water obtained from natural sources contains suspended impurities. Alum is added to coagulate the suspended impurities and to make water fit for drinking.
2. Tanning: Animal hides are colloidal in nature. When a hide (positively charged) is soaked in tannin which contains negatively charged colloids, mutual coagulation occurs, and leather hardens.
3. Rubber industry: Latex is a colloidal solution of rubber particles which are negatively charged.
4. Formation of delta: These are prepared by coating an emulsion of the light sensitive silver bromide in gelatine over glass plates or celluloid films.
5. Industrial products: Paints, ink, synthetic plastics, rubber, graphite lubricants, cement etc.
Hence option 1 is correct.
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