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Permanent hardness of water arises due to the presence of
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Correct option is A
The permanent hardness of water is due to the presence of soluble salts CaCl2 & MgCl2 , CaSO4 & MgSO4i.e., Chlorides, Sulphates of Ca & Mg→ Bicarbonates of Ca & Mg causes temporary hardness for water→ CaCO3 & MgCO3 are soluble salts, which donot causes hardness to water.
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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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