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Classify the following into those causing temporary hardness and permanent hardness:

[Mg(HCO3)2 , MgCl2 , CaCO3 , CaSO4 , NaCl, NaHCO3 , Ca(HCO3)2 ]

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Temporary hardness – [Mg(HCO3)2, Ca(HCO3)2

Permanent hardness – MgCl2, CaSO4

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