MEDIUMMCQ SINGLEJEE Advanced ChemistryInorganic ChemistryHydrogenPrevious Year Questions

The method used to remove temporary hardness of water is (NEET 2019)

A.synthetic resins method (b) Calgon’s method

C.Clark’s method✓ Correct

D.ion-exchange method

Explanation

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 react with lime water to form insoluble calcium and magnesium carbonates which can be easily filtered off. 2 2 Quick Lime Lime Water CaO H O Ca(OH) -> 3 2 2 3 2 Ca(HCO ) Ca(OH) 2CaCO 2H O -> 3 2 2 3 2 2 Mg(HCO ) 2Ca(OH) 2CaCO Mg(OH ) 2H O -> HYDROGEN 27

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