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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?

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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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