Question:
Which one of the following methods is most suitable for preparing deionized water?
Correct Option: 1,
Solution:
Pure demineralised (de-ionized) water free from all soluble mineral salts is obtained by passing water successively through a cation exchange (in the $\mathrm{H}^{+}$ form) and an anion exchange (in the $\mathrm{OH}$ form) resins.
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