Chapter Exam

Unit 13: Purification and Characterisation of Organic Compounds — Online MCQ Test

Q: Match the List-I (Mixture) with List-II (Method of Separation). List-I: (A) CHCl₃ + C₆H₅NH₂, (B) Crude oil, (C) Glycerol from spent-lye, (D) Aniline-water.

Answer: A. A-IV, B-III, C-I, D-II — CHCl₃ + Aniline -> Simple Distillation. Crude oil -> Fractional Distillation. Glycerol -> Reduced pressure distillation. Aniline-water -> Steam distillation.

Q: Match the List-I with List-II. List-I (Mixture): A. CHCl3 + C6H5NH2, B. Crude oil in petroleum industry, C. Glycerol from spent-lye, D. Aniline-water List-II (Method of Separation): I. Distillation under reduced pressure, II. Steam distillation, III. Fractional distillation, IV. Simple distillation

Answer: A. A-IV, B-III, C-I, D-II — CHCl3 + C6H5NH2 are separated by simple distillation. Crude oil is separated by fractional distillation. Glycerol is separated from spent-lye by distillation under reduced pressure. Aniline-water is separated by steam distillation.

Q: On heating, some solid substances change from solid to vapour state without passing through the liquid state. The technique used for the purification of such solid substances based on the above principle is known as:

Answer: D. Sublimation — Sublimation is the process in which a solid directly changes into vapour without becoming liquid; it is used to purify sublimable solids.

Q: Fog is colloidal solution of :-

Answer: A. Liquid in gas — Fog is a colloidal system where liquid droplets are dispersed in a gas medium (air).

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Practice Unit 13: Purification and Characterisation of Organic Compounds with a free chapter-wise online MCQ test for NEET NEET (All) CHEMISTRY. This chapter covers: Purification - Crystallization sublimation distillation differential extraction and chromatography - principles and their applications. Qualitative analysis - Detection of nitrogen.... AI-generated questions from basic to board-exam level, with instant results and explanations.

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Unit 13: Purification and Characterisation of Organic Compounds — Important Questions & Answers (FAQ)

Frequently asked questions from NEET NEET (All) CHEMISTRY — Unit 13: Purification and Characterisation of Organic Compounds, with answers and explanations. These are sample questions; the exam has its own separate question set.

Match the List-I (Mixture) with List-II (Method of Separation). List-I: (A) CHCl₃ + C₆H₅NH₂, (B) Crude oil, (C) Glycerol from spent-lye, (D) Aniline-water.

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

Answer: A. A-IV, B-III, C-I, D-II
CHCl₃ + Aniline -> Simple Distillation. Crude oil -> Fractional Distillation. Glycerol -> Reduced pressure distillation. Aniline-water -> Steam distillation.

Match the List-I with List-II. List-I (Mixture): A. CHCl3 + C6H5NH2, B. Crude oil in petroleum industry, C. Glycerol from spent-lye, D. Aniline-water List-II (Method of Separation): I. Distillation under reduced pressure, II. Steam distillation, III. Fractional distillation, IV. Simple distillation

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

Answer: A. A-IV, B-III, C-I, D-II
CHCl3 + C6H5NH2 are separated by simple distillation. Crude oil is separated by fractional distillation. Glycerol is separated from spent-lye by distillation under reduced pressure. Aniline-water is separated by steam distillation.

On heating, some solid substances change from solid to vapour state without passing through the liquid state. The technique used for the purification of such solid substances based on the above principle is known as:

A. Distillation
B. Chromatography
C. Crystallization
D. Sublimation ✓

Answer: D. Sublimation
Sublimation is the process in which a solid directly changes into vapour without becoming liquid; it is used to purify sublimable solids.

Which of the following statements is incorrect?

A. NaCl(s) is an insulator, silicon is a semiconductor, silver is a conductor, quartz is a piezoelectric crystal
B. Frenkel defect is favoured in those ionic compounds in which sizes of cation and anion are almost equal ✓
C. FeO0.98 has non-stoichiometric metal deficiency defect
D. Density decreases in case of crystals with Schottky's defect

Answer: B. Frenkel defect is favoured in those ionic compounds in which sizes of cation and anion are almost equal
Frenkel defect is favoured when there is a large difference in cation and anion sizes; it is not favoured when sizes are almost equal.

Fog is colloidal solution of :-