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

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less efficient as the resins cannot be regenerated

more efficient as it can exchange only cations

less efficient as it exchanges only anions

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

answer is D.

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Detailed Solution

In comparison to the zeolite process for the removal of permanent hardness, the synthetic resin method is more efficient as it can exchange both cations as well as anions. Since the zeolite process utilizes the mineral zeolite as the exchanging resin for only cation in hard water, and synthetic resins method utilizes many different resins for the ion exchange, hence, it is more efficient.
Other methods for removing permanent hardness is cold lime-soda process or hot lime-soda process. In this method, calculated amounts of lime and soda are added so that the soluble calcium and magnesium salts in water are chemically converted into insoluble compounds.

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