The method that can not be used for removing permanent hardness...

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Namrata Jangate

9 years ago

The method that can not be used for removing permanent hardness of water is?

A. Adding Sodium carbonate

B. Distillation

C. Adding caustic soda

D. Boiling

Answer: Option D

Solution (By Examveda Team)

Temporary hardness is caused by dissolved calcium hydrogencarbonate (which is removed by boiling). Permanent hardness is caused by dissolved calcium sulfate (which is not removed by boiling). Water can be softened using washing soda or an ion-exchange resin.

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