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Why do we add alum to purify water?...

Why do we add alum to purify water?

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Alum coagulates the colloidal impurities present in water, thus making water potable.
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CHHAYA PUBLICATION-SURFACE CHEMISTRY-Solved NECRT Exempler Problems
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  2. What is collodion?

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  3. Why do we add alum to purify water?

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  4. What happens when electric field is applied to colloidal solution?

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  5. What causes brownian motion in colloidal dispersion?

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  6. A colloid is formed by adding FeCl(3) in excess of hot water. What wil...

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  7. How do emulsifying agents stabilise the emulsion .

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  8. Why do some medicines more effective in colloidal form ?

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  9. Why does leather get hardened after tanning?

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  10. How does the precipitation of colloidal smoke taken place in Cottrell ...

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  11. How will you distinguish between dispersed phase andn dispersion mediu...

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  12. On the basis of Hardy-Schulze rule explain why the coagulating power o...

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  13. Why does bleeding stop by rubbing moist alum?

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  14. Why is Fe(OH)(3) colloid positively charged, when prepared by adding F...

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  16. What happens when dialysis is prolonged?

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  17. Why does the white precipitate of silver halide become coloured in the...

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  18. What is the role of activated charcoal in gas mask used in coal mines?

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  19. How does a delta form at the meeting place of sea and river water?

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  20. Give an example where physisorption changes to chemisorption with rise...

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