Q: Pure, demineralized water, free from all soluble mineral salts is obtained by which of the following method?
(a)Passing water through microfiltration membrane
(b)Calgon's method
(c)Passing water through a cation exchange and an anion exchange resin bed
(d)By boiling
Correct Answer: (c)
The correct answer is (b) 'कैल्साइन विधि'. This question from the General Studies domain tests knowledge of Miscellaneous.