In comparison to the zeolite process for the removal of permanent hardness, the synthetic resins method is

Question

In comparison to the zeolite process for the removal of permanent hardness, the synthetic resins method is (A) More efficient as it can exchange only cations (B) Less efficient as the resins cannot be regenerated (C) More efficient as it can exchange both cations as well as anions (D) Less efficient as it exchanges only anions.

Tardigrade Admin · Accepted Answer

(A) Zeolite method removes only cations (

C a^{2 +}

and

M g^{2 +}

ion) present in hard water

2 N a Z + M^{2 +} (a q) \to M Z_{2} (s) + 2 N a + (a q) (M \to M g, C a)

(B) Synthetic resin method removes cations (

C a^{2 +}

and

M g^{2 +}

ion) and anions (like

C l^{-}, H C O_{3}^{-}, S O_{4}^{2 -}

etc.)

Q. In comparison to the zeolite process for the removal of permanent hardness, the synthetic resins method is

More efficient as it can exchange only cations

Less efficient as the resins cannot be regenerated

More efficient as it can exchange both cations as well as anions

Less efficient as it exchanges only anions.

(A) Zeolite method removes only cations ( Ca2+ and Mg2+ ion) present in hard water 2NaZ+M2+(aq)→MZ2​(s)+2Na+(aq)(M→Mg,Ca) (B) Synthetic resin method removes cations ( Ca2+ and Mg2+ ion) and anions (like Cl−,HCO3−​,SO42−​ etc.)