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surender

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· 1 Months ago

surender (Question: 137849.0 )

ion exchange method as per many books and online study and net

Question:

Zero hardness of water is achieved by:

Options:
A) lime soda process
B) excess lime
C) ion exchange process
D) excess alum
Solution:
Ans: (c) Ion exchange process is used for zero hardness water. 

A variety of dissolved solids can be removed by ion exchange. For hardness removal by zeolite (a naturally occurring sodium alumino-silicate material sometime called green sand) and synthetic resins are used.

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