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Question

Both temporary and permanent hardness in water is removed by________.

  1. boiling
  2. filtration
  3. distillation
  4. decantation

A
boiling
B
distillation
C
decantation
D
filtration
Solution
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Both temporary and permanent hardness in water is removed by distillation. Temporary hardness can be removed by boiling and filtration. Permanent hardness can be removed by adding washing soda, permutit method, and by using ion-exchange resins.

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