Question:
Addition of Alum in water treatment increases:
Addition of Alum in water treatment increases:
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Alum is primarily used as a coagulant in water treatment to destabilize colloidal parti cles but also increases acidity
Updated On: Jan 17, 2026
- Acidity and hardness of water
- Alkalinity and hardness of water
- Sulphate and sulphides in water
- Carbonate and bicarbonates in water
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The Correct Option is A
Solution and Explanation
Alum\( (Al_2(SO_4)_3)\) reacts with water to form sulphuric acid, which lowers the pH (increases acidity). The aluminium ions react with bicarbonates in the water, leading to the formation of insoluble precipitates that contribute to water hardness.
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