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EEJ MAIN Chemistry QUESTION #7505
Question 1

Match the mixtures in Item I with the correct separation methods in Item II:

Item I (Mixture)Item II (Method)
(A) H$_2$O : Sugar(P) Sublimation
(B) H$_2$O : Aniline(Q) Recrystallization
(C) H$_2$O : Toluene(R) Steam distillation
(S) Differential extraction
  • (A)→(S); (B)→(R); (C)→(P)
  • (A)→(Q); (B)→(R); (C)→(S)✔️
  • (A)→(R); (B)→(P); (C)→(S)
  • (A)→(Q); (B)→(R); (C)→(P)
Correct Answer Explanation

Separation logic:

  • H$_2$O + Sugar: Sugar is a solid dissolved in water. Recovered by evaporating water and allowing the sugar to crystallize — this is recrystallization (Q).
  • H$_2$O + Aniline: Aniline is slightly miscible with water and has a high boiling point. It is separated by steam distillation (R) — aniline distils with steam below its normal boiling point.
  • H$_2$O + Toluene: Toluene is immiscible with water. Separated by differential extraction (S) using a separating funnel.

Correct: (A)→(Q), (B)→(R), (C)→(S)