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Name two salts each of calcium and magne...

Name two salts each of calcium and magnesium which make the water hard?

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Calcium chloride - `CaCl_(2) " " ` Magnesium chloride - `MgCl_(2)`
Calcium sulphate - `CaSO_(4) " " ` Magnesium sulphate - `MgSO_(4)`
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