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What causes the temporary and permanent ...

What causes the temporary and permanent hardness of water ?

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Presence of bicarbonates of calcium and magnesium , i.e., `(Ca(HCO_(3))_(2)` and `Mg(HCO_(3))_(2)` in water cause temporary hardness and presence of soluble chloride and sulphates of calcium and magnesium , i.e., `CaCl_(2), CaSO_(4), MgCl_(2) and MgSO_(4)` in water causes permanent hardness.
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PRADEEP-HYDROGEN -NCERT Questions and Exercises with Answers (NCERT INTEXT SOLVED QUESTIONS)
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  19. How does H(2)O(2) behave as a bleaching agent?

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