Pure, demineralized water, free from all soluble mineral salts is obtained by which of the following method?
[amp_mcq option1=”Passing water through microfiltration membrane” option2=”Calgon’s method” option3=”Passing water through a cation exchange and an anion exchange resin bed” option4=”By boiling” correct=”option3″]
This question was previously asked in
UPSC CAPF – 2023
Demineralization or deionization is the process of removing mineral salts from water. Ion exchange is a highly effective method for achieving this. Cation exchange resins replace positive ions (like Ca²⁺, Mg²⁺, Na⁺) with H⁺ ions, and anion exchange resins replace negative ions (like Cl⁻, SO₄²⁻, HCO₃⁻) with OH⁻ ions. The H⁺ and OH⁻ ions then combine to form water (H₂O).