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NEET levelSingle correct optionDifficulty 1 of 3eq203

Temporary hardness of water is caused by the presence of:

  1. Achlorides and sulphates of sodium
  2. Bsulphates of calcium and magnesium
  3. Cchlorides of calcium and magnesium
  4. Dbicarbonates of calcium and magnesium

Answer: D

Temporary hardness is due to and , which can be removed by boiling. Chlorides and sulphates of calcium and magnesium cause permanent hardness, and sodium salts do not cause hardness.
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