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(D) Zeolite is a hydrated sodium alumino-silicate,represented as $Na_2Z$. When hard water containing $Ca^{2+}$ and $Mg^{2+}$ ions is passed through a

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

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(D) Zeolite is a hydrated sodium alumino-silicate,represented as $Na_2Z$. When hard water containing $Ca^{2+}$ and $Mg^{2+}$ ions is passed through a bed of zeolite,the sodium ions $(Na^{+})$ are exchanged with the calcium and magnesium ions present in the hard water. The reaction is: $Na_2Z + Ca^{2+} 	ext{ or } Mg^{2+} 	o CaZ 	ext{ or } MgZ + 2Na^{+}$.

When zeolite is treated with hard water,the sodium ions are exchanged with

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