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प्रश्न
Permanent hardness in water cannot be cured by ______.
पर्याय
Treatment with washing soda.
Boiling
Calgon's method
Ion exchange method
MCQ
रिकाम्या जागा भरा
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उत्तर
Permanent hardness in water cannot be cured by Boiling.
Explanation:
Boiling removes only temporary hardness caused by \[\ce{HCO^-_3}\] (bicarbonate) ions.
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Water - Temporary Hardness of Water
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