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(D) Zeolite is represented as $NaAlSiO_4$. When hard water containing $Ca^{2+}$ and $Mg^{2+}$ ions is passed through a bed of zeolite,the sodium ions

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$Ca^{2+}$ and $Mg^{2+}$ ions

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(D) Zeolite is represented as $NaAlSiO_4$. When hard water containing $Ca^{2+}$ and $Mg^{2+}$ ions is passed through a bed of zeolite,the sodium ions $(Na^+)$ in the zeolite are replaced by $Ca^{2+}$ and $Mg^{2+}$ ions. The reaction is: $Na_2Al_2Si_2O_8(s) + M^{2+}(aq) \rightarrow MAl_2Si_2O_8(s) + 2Na^+(aq)$ (where $M = Ca, Mg$). This process effectively removes the hardness-causing ions from the water.

When zeolite,which is a hydrated sodium aluminium silicate,is treated with hard water,the sodium ions are exchanged with which of the following?

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