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1042 0

Q: 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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Answer : 2. "in the purification of water"
Explanation :
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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