JEE Main · 2020 · 07 Jan 2020 · Shift 1 · Hydrogen

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

(A)less efficient as it exchanges only anions
(B)more efficient as it can exchange only cations
(C)less efficient as the resin cannot be regenerated
(D)more efficient as it can exchange both cation as well as anions✓ Correct

Answer: (D)

Solution

The zeolite process can only swap cations, so it softens water without removing anions. A synthetic ion-exchange plant uses both a cation-exchange and an anion-exchange resin, so it removes cations and anions alike and fully demineralises the water, making it the more efficient method because it exchanges both cations and anions.

JEE Main · 2020 · 07 Jan 2020 · Shift 1 · Single correct option

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