InterviewSolution
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InterviewSolution
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Water obtained by purification with organic ion exchange resins isA. Pure waterB. Free from only `Ca^(2+),Mg^(2+)` ionsC. Free from `HCO_(3)^(-),SO_(4)^(2-)` and `Cl^(-)` ions onlyD. None of these |
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Answer» Correct Answer - D Ion exchange resins remove all soluble minerals from water. The hard water is first passed through a bed of cation exchanger, which removes the cations like `Na^(+),Mg^(2+),Ca^(2+)` and others by exchanging with `H^(+)` ions. `underset("Resin")2RH+Ca^(2+)rarr(R)_(2)Ca+2H^(+)` The water coming from cation exchanger is acidic on account of free `H^(+)` ions. This water is then passed through another bed containing anion exchanger. This exchanger removes anions like `Cl^(-),SO_(4)^(2-),NO_(3)^(-)` by exchanging with `OH^(-)` ions. `R-underset("Resin")NH_(3)OH+Cl^(-)rarrR-NH_(3)Cl+OH^(-)` |
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