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  4. Which one of the following methods is most suitable for preparing deionized water?

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Q. Which one of the following methods is most suitable for preparing deionized water?

JEE MainJEE Main 2021Hydrogen

Solution:

Pure demineralised (de-ionized) water free from all soluble mineral salts is obtained by passing water successively through a cation exchange (in the $H ^{+}$ form) and an anion exchange (in the $OH ^{-}$form) resins.