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Which will produce hard water ?
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By Expert Faculty of Sri Chaitanya
a
Saturation of water with CaSO4
b
Addition of Na2SO4 to water
c
Saturation of water with CaCO3
d
Saturation of water with MgCO3
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Correct option is A
(1) Presence of Chlorides and sulphates of Ca and Mg causes permanent hardness.(2) Presence of bicarbonates of ca and Mg causes temporary hardness.
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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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