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JEE Main levelSingle correct optionDifficulty 2 of 3pb152

Zeolites are used as water softeners because

Athey precipitate $Ca X^{2 +}$ as $CaCO X_{3}$ by releasing carbonate
Btheir $Na X^{+}$ ions are exchanged for $Ca X^{2 +}$ and $Mg X^{2 +}$ ions of hard water
Cthey oxidise $Mg X^{2 +}$ to $Mg$
Dthey absorb chloride ions of water

Answer: B

Zeolites are aluminosilicates with a negatively charged framework balanced by exchangeable

Na X^{+}

. Hard-water

Ca X^{2 +}

and

Mg X^{2 +}

replace these, and the zeolite can be regenerated with NaCl solution.

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