Which of the following is not used for soften | vedclass

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(D) Water softening involves the removal of calcium $(Ca^{2+})$ and magnesium $(Mg^{2+})$ ions from hard water.$A$. Washing soda $(Na_2CO_3)$ is used

Vedclass · Accepted Answer

$CaCO_3$

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(D) Water softening involves the removal of calcium $(Ca^{2+})$ and magnesium $(Mg^{2+})$ ions from hard water.$A$. Washing soda $(Na_2CO_3)$ is used to remove permanent hardness by precipitating calcium and magnesium ions as carbonates.$B$. Calgon $(Na_2[Na_4(PO_3)_6])$ is used to sequester calcium and magnesium ions,preventing them from forming precipitates.$C$. Sodium zeolite $(Na_2Al_2Si_2O_8 \cdot xH_2O)$ is an ion-exchange resin used to replace $Ca^{2+}$ and $Mg^{2+}$ ions with $Na^+$ ions.$D$. $CaCO_3$ (calcium carbonate) is a source of hardness in water,not a softening agent. Therefore,it is not used for softening water.

Which of the following is not used for softening of water?

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