15-Which of the following(s) is hare comest? 1. In Ina-Exchange separation technique negatively- chargedices of the solution attached on cation exchange resin 11-A substance that affects an analytical signal or the background is called an interference. III.As the occentration of solute which remains in aqueous solution decreases extraction efficiency increases. A) Only I B) Only I C) I and II D) I and III E) II and III

Question

15-Which of the following(s) is hare comest? 1. In Ina-Exchange separation technique negatively- chargedices of the solution attached on cation exchange resin 11-A substance that affects an analytical signal or the background is called an interference. III.As the occentration of solute which remains in aqueous solution decreases extraction efficiency increases. A) Only I B) Only I C) I and II D) I and III E) II and III

Answer 1

The correct answer is C) I and II.Explanation:I. In ion-exchange separation, negatively-charged ions of the solution are attached to the cation exchange resin. This is correct.II. A substance that affects an analytical signal or the background is called an interference. This is also correct.III. As the concentration of solute which remains in aqueous solution decreases, extraction efficiency increases. This statement is incorrect. The correct statement would be: As the concentration of solute which remains in aqueous solution increases, extraction efficiency decreases.Therefore, the correct answer is C) I and II.

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