In which of the following method of the removal of hardness, \( \ma...

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In which of the following method of the removal of hardness, \( \mathrm{Ca}^{+2} \) and \( \mathrm{Mg}^{2+} \) are not separated from sample of hard water?
\( \mathrm{P} \)
(a) By boiling of temporary hard water
(b) Addition of sodium carbonate
W
(c) Using sodium hexa meta phosphate
(d) Synethetic resins and zeolite method
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