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Pure, demineralized water, free from all soluble mineral salts is obtained by which of the following method ?

This questions was previously asked in

CAPF 2023 Paper-1

Passing water through microfiltration membrane

Calgon's method

Passing water through a cation exchange and an anion exchange resin bed

By boiling

Passing water through a cation exchange and an anion exchange resin bed.

Passing water through a cation exchange resin bed and then an anion exchange resin bed can produce demineralized water,
which is free of soluble mineral salts and as pure as distilled water.