In the purification of portable water the coagulant used is_________________?
Correct answer: A. alum
- A. alum
- B. nickel sulphate
- C. copper sulphate
- D. barium sulphate
Explanation
Alum acts as a coagulant: it forms gelatinous aluminium hydroxide in water, which traps and settles suspended impurities. Nickel sulphate, copper sulphate and barium sulphate are not the usual coagulants for portable-water purification. The common mistake is choosing copper sulphate because it can kill some algae, but that is not its role as a coagulant.
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About Properties of Liquids
Liquid behavior depends on intermolecular forces, which produce surface tension, viscosity, capillary action and a definite volume without a fixed shape. The topic also covers vapor pressure, evaporation, boiling point and the effect of temperature and external pressure, while distinguishing evaporation at the surface from boiling throughout the liquid.
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