Permanent hardness due to \[M{{g}^{2+}}\] ions is best removed by

1.	Permanent hardness due to \[M{{g}^{2+}}\] ions is best removed by
A.	\[Ca{{(OH)}_{2}}\]
B.	\[N{{a}_{2}}C{{O}_{3}}\]
C.	\[N{{a}_{2}}C{{O}_{3}}+Ca{{(OH)}_{2}}\]
D.	None of these
Answer» D. None of these

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Permanent hardness due to \[M{{g}^{2+}}\] ions is best removed by

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