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Which of the following salts is the main cause of permanent hardness of water?

September 21, 2022
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Which of the following salts is the main cause of permanent hardness of water?

Q. Which of the following salts is the main cause of permanent hardness of water?

  1. Magnesium sulphate
  2. Magnesium bicarbonate
  3. Magnesium carbonate
  4. None of the above

Answer: Magnesium sulphate.

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