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Permanent hardness due to ions is best removed by
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Correct option is C
CaOH2 removes the permanent hardness due to Mg2+ ion, but it produces Ca2+ ions which are removed by Na2CO3.Mg2+ + CaOH2 → MgOH2 ↓ + Ca2+Ca2+ + Na2CO3 → CaCO3 ↓ + 2Na+CaOH2 or Na2CO3 alone cannot remove the permanent hardness.Similar Questions
The molecular formula of a commercial resin used for exchanging ion in water softening is C8H7SO3 Na (mol. wt. = 206). What would be the minimum uptake of Ca2+ ions by the resin when expressed in mole per gram resin ?
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