Zeolites are

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(D) Zeolites are aluminosilicates with a three-dimensional honeycomb-like structure. $1$. They act as water softeners because they function as ion exc

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All of the above

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(D) Zeolites are aluminosilicates with a three-dimensional honeycomb-like structure. $1$. They act as water softeners because they function as ion exchangers,replacing $Ca^{2+}$ and $Mg^{2+}$ ions in hard water with $Na^+$ ions. $2$. They act as catalysts in shape-selective catalysis due to their porous structure,such as $ZSM-5$ which converts alcohols to gasoline. $3$. They act as cation exchangers by exchanging their sodium ions for other cations. Since zeolites exhibit all these properties,the correct answer is $D$.

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