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When zeolite (hydrated sodium aluminium silicate) is treated with hard water, the sodium ions are exchanged with

  

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When zeolite (hydrated sodium aluminium silicate) is treated with hard water, the sodium ions are exchanged with

(a) H+ ions

(b) Ca2+ ions

(c) SO42- ions

(d) OH- ions

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Correct answer: (b) Ca2+ ions

Explanation:

Na zeolite + CaCl2 → Ca zeolite + 2NaCl

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