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AP EAMCET202317 May 2023Morning ShiftChemistryHydrogenActual

The following methods can not be used to remove permanent hardness of water

Options

  1. ATreatment with washing soda
  2. BIon-exchange method
  3. CTreating with Calgon
  4. DAdding calculated amount of lime

Correct answer

D. Adding calculated amount of lime

Step-by-step solution

(d) Lime is added to hard water to remove temporary hardness. (Clark's method) Ca ( HCO ₃ )₂+ Ca ( OH )₂ 2 Ca CO ₃ +2 H ₂ O

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