34. Which of the following separations could be achieved by ion exchange or ion-exchange chromatography? (A) Mixture of U235 and U238 (B) Mixture of sea salt and mineral salt (C) Mixture of dyes (D) Mixture of simple sugars (E) Mixture of alcohols

10. Polystyrene is an addition polymer of styrene. What would be the effect if some divinylbenzene were added to styrene and then polymerized? (A) The second polymer would be made less flammable than pure polystyrene. (B) The polymer would be more flexible. Divinylbenzene acts as a plasticizer. (C) Divinylbenzene would act as a cross-linking agent, making the polymer stronger. (D) There would be no effect on the properties of the polymer. (E) There would be an effect, but it cannot be predicted.

34. Which of the following separations could be achieved by ion exchange or ion-exchange chromatography?
(A) Mixture of U²³⁵ and U²³⁸
(B) Mixture of sea salt and mineral salt
(C) Mixture of dyes
(D) Mixture of simple sugars
(E) Mixture of alcohols

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