which of the following does not cause hardness of water?- MgCl2, MgSo4, Ms(HCO3)2, MgCO3

All the four salts cause hardness. MgCl2 and MgSO4 cause permanent hardness of water, while Mg(HCO3)2 and MgCO3 cause temporary hardness of water.

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i think the answer is Mg(HCO3)2, but how?

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Aren't all of them salts? 

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