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1. Name the oxide of isotope of hydrogen used in nuclear reactor. 2. What are cation exchange resins? What is their role in removing permanent hardness of water?

Answer»

1. Heavy water (D2O). 

2. Cation exchange resins contain large organic molecule with -SO3H group and are water insoluble. Ion exchange resin (RSO3H) is changed to RNa by treating with NaCl. The resin exchanges Na+ ions with Ca2+ and Mg2+ ions present in hard water to make the water soft.



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