Which of the following will cause softening o | vedclass

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(A) The correct option is $(A)$. Hardness of water is primarily due to the presence of $Ca^{2+}$ and $Mg^{2+}$ ions. In the cation exchange process,ha

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Passing it through cation exchange resin

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(A) The correct option is $(A)$. Hardness of water is primarily due to the presence of $Ca^{2+}$ and $Mg^{2+}$ ions. In the cation exchange process,hard water is passed through a cation exchange resin (containing $R-SO_3H$ or $R-COOH$ groups). The $Ca^{2+}$ and $Mg^{2+}$ ions are exchanged with $H^+$ or $Na^+$ ions present in the resin,thereby removing the hardness.

List-$I$	List-$II$
$A$. Treatment with washing soda	$I$. $Ca(OH)_2$
$B$. Calgon's method	$II$. $Na_2CO_3$
$C$. Clark's method	$III$. $NaAlSiO_4$
$D$. Zeolite/permutit process	$IV$. $Na_6P_6O_{18}$

Which of the following will cause softening of hard water?

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