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When zeolite is treated with hard water, the sodium ions are exchanged with : (AMU 2012)
(a) \( \mathrm{H}^{+} \)ions
(b) \( \mathrm{H}^{+} \)and \( \mathrm{Ca}^{2+} \) ions
\( \mathrm{P} \)
(c) \( \mathrm{OH}^{-} \)and \( \mathrm{Mg}^{2+} \) ions
(d) \( \mathrm{Ca}^{2+} \) and \( \mathrm{Mg}^{2+} \) ions
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