Which of the following reagents is not used f | vedclass

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(D) Permanent hardness of water is caused by the presence of soluble salts of magnesium and calcium in the form of chlorides and sulphates in water. $

Vedclass · Accepted Answer

$Ca(OH)_2$

Vedclass · Answer

(D) Permanent hardness of water is caused by the presence of soluble salts of magnesium and calcium in the form of chlorides and sulphates in water. $Na_6P_6O_{18}$ (Calgon) is used to remove permanent hardness by sequestering $Ca^{2+}$ and $Mg^{2+}$ ions. $Na_2CO_3$ (Washing soda) removes permanent hardness by precipitating calcium and magnesium ions as carbonates. Zeolite $(NaAlSiO_4)$ is used in the ion-exchange method to remove permanent hardness. $Ca(OH)_2$ (Slaked lime) is used for the removal of temporary hardness of water (Clark's method),not permanent hardness.

Which of the following reagents is not used for the removal of permanent hardness of water?

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