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JEE Main 2025 Apr 4 Shift 2, Chemistry Q9: Purification Methods

JEE Main2025Apr 4, Shift 2Chemistry
Q.

Match List-I with List-II -

List-I (Separation of)List-II (Separation Technique)
(A)Aniline from aniline-water mixture(I)Simple distillation
(B)Glycerol from spent-lye in soap industry(II)Fractional distillation
(C)Different fractions of crude oil in petroleum industry(III)Distillation at reduced pressure
(D)Chloroform-Aniline mixture(IV)Steam distillation

Choose the correct answer from the options given below :

  1. A

    (A)-(IV), (B)-(III), (C)-(II), (D)-(I)

  2. B

    (A)-(I), (B)-(II), (C)-(III), (D)-(IV)

  3. C

    (A)-(III), (B)-(IV), (C)-(I), (D)-(II)

  4. D

    (A)-(II), (B)-(I), (C)-(IV), (D)-(III)

Solution

Pair each separation with the standard technique used industrially.

(A) Aniline from aniline-water: aniline is steam-volatile and decomposes near its bp (), so steam distillation (IV) is used.

(B) Glycerol from spent-lye: glycerol decomposes below its normal bp, so it is distilled under reduced pressure (III).

(C) Crude-oil fractions: components have close, overlapping boiling ranges, so fractional distillation (II) is used.

(D) Chloroform (bp ) and aniline (bp ) differ widely in bp, so simple distillation (I) suffices.

A-IV, B-III, C-II, D-I.

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