What does Purification and Characterisation of Organic Compounds cover for NEET Chemistry?

8 lessons: Chromatography, Crystallization, Differential Extraction, Distillation, Empirical Molecular Formula Calculation, Qualitative N, S, P and Halogens, Quantitative CHN and Sublimation.

How often has Purification and Characterisation of Organic Compounds come up in NEET past papers?

Our set of verified past papers has 7 questions from this unit, from NEET 2020, 2021, 2022, 2023, 2024 and 2025. Each is answered against the official NTA key.

Purification and Characterisation of Organic Compounds

8 lessons

Topic index in NCERT order

6 of 8 lessons by the NCERT chapter they teach from, in book order. The page is the first printed page of your NCERT book the lesson cites; PYQs are the past NEET questions on that topic.

Chromatography

8 MCQs1 PYQs2 revision cardsWorked example

Easy Recall (3)Direct Application (3)Calculation (2)

Crystallization

8 MCQsWorked example

Easy Recall (2)Concept Trap (2)Direct Application (2)Calculation (2)

Differential Extraction

8 MCQsWorked example

Easy Recall (3)Direct Application (3)Concept Trap (1)Calculation (1)

Distillation

8 MCQs1 PYQsWorked example

Easy Recall (3)Direct Application (3)Calculation (2)

Empirical Molecular Formula Calculation

8 MCQs1 PYQs3 revision cardsWorked example

Easy Recall (3)Direct Application (3)Concept Trap (1)Calculation (1)

Qualitative N, S, P and Halogens

8 MCQs2 PYQsWorked example

Easy Recall (3)Direct Application (3)Calculation (2)

Quantitative CHN

8 MCQs1 PYQs5 revision cardsWorked example

Easy Recall (3)Direct Application (3)Calculation (2)

Sublimation

8 MCQs1 PYQsWorked example

Easy Recall (2)Direct Application (2)Concept Trap (2)Calculation (2)

Past-paper questions from this unit

7 questions from NEET 2020, 2021, 2022, 2023, 2024, 2025. Answers verified against NTA official keys.

By year in our set: 2020 (1) · 2021 (1) · 2022 (1) · 2023 (1) · 2024 (1) · 2025 (2)

Lesson: Distillation

NEET 2025

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

1A-III, B-IV, C-II, D-I

2A-IV, B-III, C-I, D-II

3A-IV, B-III, C-II, D-I

4A-III, B-IV, C-I, D-II

NTA Answer: Option 2(final)

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Lesson: Qualitative N, S, P and Halogens

NEET 2025

Which one of the following reactions does NOT belong to “Lassaigne’s test”?

12CuO + C —[Δ]→ 2Cu + CO₂

2Na + C + N —[Δ]→ NaCN

32Na + S —[Δ]→ Na₂S

4Na + X —[Δ]→ NaX

NTA Answer: Option 1(final)

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Lesson: Sublimation

NEET 2024Revised key

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

1Crystallization

2Sublimation

3Distillation

4Chromatography

NTA Answer: Option 2(revised_final)

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Lesson: Qualitative N, S, P and Halogens

NEET 2023

In Lassaigne’s extract of an organic compound, both nitrogen and sulphur are present, which gives blood red colour with Fe³⁺ due to the formation of

1NaSCN

2[Fe(CN)₅NOS]⁴⁻

3[Fe(SCN)]²⁺

4Fe₄[Fe(CN)₆]₃·xH₂O

NTA Answer: Option 3(final)

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Lesson: Quantitative CHN

NEET 2022

The Kjeldahl's method for the estimation of nitrogen can be used to estimate the amount of nitrogen in which one of the following compounds?

1Azobenzene, C6H5–N=N–C6H5

2Nitrobenzene, C6H5NO2

3Pyridine, C5H5N

4Aniline, C6H5NH2

NTA Answer: Option 4(final)

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Lesson: Empirical Molecular Formula Calculation

NEET 2021

An organic compound contains 78% (by wt.) carbon and remaining percentage of hydrogen. The right option for the empirical formula of this compound is : [Atomic wt. of C is 12, H is 1]

1CH4

2CH

3CH2

4CH3

NTA Answer: Option 4(final)

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Lesson: Chromatography

NEET 2020

Paper chromatography is an example of :

1Column chromatography

2Adsorption chromatography

3Partition chromatography

4Thin layer chromatography

NTA Answer: Option 3(final)

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Questions about this unit

What does Purification and Characterisation of Organic Compounds cover for NEET Chemistry?: 8 lessons: Chromatography, Crystallization, Differential Extraction, Distillation, Empirical Molecular Formula Calculation, Qualitative N, S, P and Halogens, Quantitative CHN and Sublimation.
How often has Purification and Characterisation of Organic Compounds come up in NEET past papers?: Our set of verified past papers has 7 questions from this unit, from NEET 2020, 2021, 2022, 2023, 2024 and 2025. Each is answered against the official NTA key.
Is the Purification and Characterisation of Organic Compounds material free?: Yes. All 8 lessons and 64 practice questions are free, with no login needed.

Purification and Characterisation of Organic Compounds

Topic index in NCERT order

Class 11 Chemistry, Chapter 1

Class 11 Chemistry, Chapter 8

Not tied to a page of the current NCERT book

Chromatography

Crystallization

Differential Extraction

Distillation

Empirical Molecular Formula Calculation

Qualitative N, S, P and Halogens

Quantitative CHN

Sublimation

Past-paper questions from this unit

Questions about this unit