Which of the following statements is not corr | vedclass

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(D) Temporary hardness is caused by the presence of bicarbonates of $Ca^{2+}$ and $Mg^{2+}$ and can be removed by boiling water.Permanent hardness is

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Permanent hardness can be removed by boiling water.

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(D) Temporary hardness is caused by the presence of bicarbonates of $Ca^{2+}$ and $Mg^{2+}$ and can be removed by boiling water.Permanent hardness is caused by the presence of soluble salts of magnesium and calcium in the form of chlorides and sulphates in water.Permanent hardness cannot be removed by boiling water; it requires chemical treatment (e.g.,washing soda,ion exchange resins).Therefore,the statement that permanent hardness can be removed by boiling is incorrect.

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 statements is not correct?

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