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Question: Answered & Verified by Expert
Permanent hardness cannot be removed by
ChemistryHydrogenKCETKCET 2021
Options:
  • A using washing soda
  • B Calgon's method
  • C Clark's method
  • D ion exchange method
Solution:
2523 Upvotes Verified Answer
The correct answer is: Clark's method
Permanent hardness cannot be removed by Clark's method. This method is used for removing temporary hardness.

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