Question:
Which of the following methods are used to remove temporary hardness of water?
I) Boiling
II) Calgon method
III) Clark's method
Which of the following methods are used to remove temporary hardness of water?
I) Boiling
II) Calgon method
III) Clark's method
II) Calgon method
III) Clark's method
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Remember: Boiling and Clark’s method target temporary hardness, while the Calgon method addresses permanent hardness.
Updated On: Jun 3, 2025
- I only
- I& III only
- II only
- I, II& III
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The Correct Option is B
Solution and Explanation
Temporary hardness of water is primarily due to the presence of bicarbonates of calcium and magnesium.
Boiling removes temporary hardness by decomposing bicarbonates into carbonates which precipitate out.
Clark's method involves the addition of lime (Ca(OH)\(_2\)) which reacts with bicarbonates to form insoluble carbonates.
Calgon method, on the other hand, is used to remove permanent hardness, not temporary hardness.
Boiling removes temporary hardness by decomposing bicarbonates into carbonates which precipitate out.
Clark's method involves the addition of lime (Ca(OH)\(_2\)) which reacts with bicarbonates to form insoluble carbonates.
Calgon method, on the other hand, is used to remove permanent hardness, not temporary hardness.
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