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Some Basic Concepts of Chemistry
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How does the ion exchange method remove hardness from water?
A. By filtering out Ca²⁺ and Mg²⁺ ions
B. By precipitating Ca²⁺ and Mg²⁺ ions
C. By boiling the water
D. By exchanging Ca²⁺ and Mg²⁺ ions with Na⁺ ions
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