Which of the following, do you think are the synthetic resins present in removal of permanent hardness?

cation exchange resins only

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anion exchange resins only

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both cation exchange resins and anion exchange resins

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neither cation exchange resins nor anion exchange resins

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Solution

The correct option is C both cation exchange resins and anion exchange resins
There are two types of synthetic resins used for removal of permanent hardness. They are cation exchange resins which are big molecules containing sulfonic acid group and an anion exchange resins which consists of giant hydrocarbon framework attached to basic groups.

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