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# Which of the following substance is not present in clear hard water

$\begin{array}{1 1}(a)\;Ca(HCO_3)_2\\(b)\;MgCl_2\\(c)\;CaSO_4\\(d)\;CaCO_3\end{array}$

$CaCO_3$ insoluble in water.
Hence (d) is the correct answer.