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Q.

Permanent hardness in water cannot be cured by :

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a

Treatment with washing soda

b

Calgon's method

c

boiling

d

Ion exchange method

answer is C.

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Detailed Solution

Boiling water will dissolve the temporary hardness. The presence of soluble calcium and magnesium salts in the form of chloride and sulfides in water is what causes the water to be permanently hard. Thus, boiling cannot dissolve permanent hardness.

Hence, option C is correct.

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