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Q:

The reason for permanent hardness of water is-

  • 1
    Carbonates of calcium and magnesium
  • 2
    Bicarbonates of calcium and magnesium
  • 3
    Chloride and sulfate of calcium and magnesium
  • 4
    None of the above
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Answer : 3. "Chloride and sulfate of calcium and magnesium"

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GK General Science Questions

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