sblock Elements 1 Question 25
43. When zeolite, which is hydrated sodium aluminium silicate, is treated with hard water, the sodium ions are exchanged with
(1990, 1M)
(a) $\mathrm{H}^{+}$ions
(b) $\mathrm{SO}_{4}^{2-}$ ions
(c) $\mathrm{Mg}^{2+}$ ions
(d) $\mathrm{OH}^{-}$ions
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Answer:
Correct Answer: 43. (a, d)
Solution:
- Zeolite acts as ion exchange resin and its $\mathrm{Na}^{+}$is exchanged with $\mathrm{H}^{+}$and $\mathrm{Mg}^{2+}$ ions present in hard water.
