Which of the following is responsible for permanent hardness of water?

  1. Magnesium bicarbonate
  2. Sodium chloride
  3. Calcium sulphate
  4. Calcium bicarbonate
Monis Rasool Professor Asked on 16th December 2015 in Chemistry.
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    Answer: (3) Calcium sulfate 

    Anurag Mishra Professor Answered on 16th December 2015.
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