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The exhausted cation exchange column is regenerated by passing a solution of ____________

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The exhausted cation exchange column is regenerated by passing a solution of ____________

(a) Dil. HCl

(b) Dil. NaCl

(c) Conc. HCl

(d) Conc. NaCl

I have been asked this question by my college director while I was bunking the class.

I want to ask this question from Ion-Exchange Resins in portion Polymers of Engineering Chemistry I

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The correct choice is (a) Dil. HCl

Explanation: The exhausted cation exchange column is regenerated by passing a solution of dil. HCl. Dil HCl is also known as brine solution.

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