Pure de-mineralised water can be obtained by

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(C) To obtain de-mineralised water (also known as de-ionized water),all dissolved mineral salts must be removed. This is achieved by passing water thr

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$H^{+}$ cation exchanger and $OH^{-}$ anion exchanger

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(C) To obtain de-mineralised water (also known as de-ionized water),all dissolved mineral salts must be removed. This is achieved by passing water through an ion-exchange resin system. First,the water passes through a cation exchange resin in the $H^{+}$ form,which replaces all metal cations (like $Ca^{2+}$,$Mg^{2+}$,$Na^{+}$) with $H^{+}$ ions. Second,the water passes through an anion exchange resin in the $OH^{-}$ form,which replaces all anions (like $Cl^{-}$,$SO_4^{2-}$,$HCO_3^{-}$) with $OH^{-}$ ions. The released $H^{+}$ and $OH^{-}$ ions combine to form water $(H^{+} + OH^{-} \rightarrow H_2O)$. Therefore,the correct method uses both $H^{+}$ cation exchanger and $OH^{-}$ anion exchanger.

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