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Bya adding which of the following the permanent hardeness of water can be removed?

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Bya adding which of the following the permanent hardeness of water can be removed?
A. Soda lime
B. Sodium bicarbonate
C. Washing soda
D. Sodium chloride.
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(c ) Both temporary and permanent hardness can be removed by adding washing soda `(Na_(2)CO_(3))`
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