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(B) $Clark's$ method is used to remove temporary hardness of water by adding calculated amounts of lime,$Ca(OH)_2$.The chemical reactions involved are

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$CaCO_3$ and $Mg(OH)_2$

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(B) $Clark's$ method is used to remove temporary hardness of water by adding calculated amounts of lime,$Ca(OH)_2$.The chemical reactions involved are:$Ca(HCO_3)_2 + Ca(OH)_2 \rightarrow 2CaCO_3(s) + 2H_2O(l)$$Mg(HCO_3)_2 + 2Ca(OH)_2 \rightarrow 2CaCO_3(s) + Mg(OH)_2(s) + 2H_2O(l)$As seen from the reactions,the insoluble metal salts formed are $CaCO_3$ and $Mg(OH)_2$.

The metal salts formed during the softening of hard water using $Clark's$ method are:

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