Chemistry-
General
Easy

Question

Which of the following is/are hard water(s)

  1. Water containing some potash alum    
  2. Water containing a few drops of HCl    
  3. Water containing common salt    
  4. Water containing calcium nitrate    

The correct answer is: Water containing calcium nitrate


    Water containing any cation other than  NH subscript 4 superscript plus and alkali metal is a hard water

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