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(A) Temporary hardness in water is caused by the presence of dissolved bicarbonates of calcium and magnesium,i.e.,$Ca(HCO_3)_2$ and $Mg(HCO_3)_2$. Per

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Magnesium bicarbonate

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(A) Temporary hardness in water is caused by the presence of dissolved bicarbonates of calcium and magnesium,i.e.,$Ca(HCO_3)_2$ and $Mg(HCO_3)_2$. Permanent hardness is caused by the presence of chlorides and sulphates of calcium and magnesium,i.e.,$CaCl_2, MgCl_2, CaSO_4,$ and $MgSO_4$.

Temporary hardness of water is due to the presence of

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