Permanent hardness in water cannot be cured by:

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Question: Answered & Verified by Expert

Permanent hardness in water cannot be cured by:

ChemistryHydrogenJEE MainJEE Main 2015 (10 Apr Online)

Options:

A Treatment with washing soda
B Ion exchange method
C Calgon's method
D Boiling

Solution:

1613 Upvotes Verified Answer

The correct answer is: Boiling

Permanent hardness due to

{S O}_{4}^{2 -}, C l^{-}

of

C a^{2 +}

and

M g^{2 +}

cannot be removed by boiling.

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