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Hardness in water is caused principally by dissolved

  • A.calcium and magnesium salts
  • B.sodium and potassium salts alone
  • C.iron and manganese salts only
  • D.dissolved organic matter

Answer: A

These two ions form insoluble compounds with soap and with many dyes and finishing agents. Sodium and potassium salts raise the dissolved solids but do not cause hardness in the technical sense. Soap and many dyes react with them directly.

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