जॉइन Examsbook
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प्र: Alum is used

  • 1
    as an analgesic
  • 2
    in the purification of water
  • 3
    as a fertilizer
  • 4
    as a disinfectant
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उत्तर : 2. "in the purification of water"
व्याख्या :

Answer: B) in the purification of water Explanation: Alum is a common alum, potassium aluminum sulphate K2SO4.Al2SO43.24H2O which makes colloidally suspended impurities in water such as clay to settle down.

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