Q.

The method used to remove temporary hardness of water is

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a

synthetic resin method

b

Calgon's method

c

Clark's method

d

ion-exchange method.

answer is C.

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Detailed Solution

Clark's process is used to remove temporary hardness of water. In this method quick lime is added. The bicarbonates present in temporary hard water reacts with lime water to form insoluble calcium and magnesium carbonate or hydroxide which can be easily filtered off.CaO+ H2O →Ca(OH)2Lime water Ca(OH)2+Ca(HCO3)2→2CaCO3+2H2O 2Ca(OH)2+Mg(HCO3)2→2CaCO3+2H2O+Mg(OH)2
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