What Are the Main Methods for Purifying Organic Compounds?
Practice the most relevant Purification And Characterisation Of Organic Compounds MCQ for NEET Chemistry with instant answer keys and explanations. This page offers exam-focused MCQs covering purification techniques, qualitative analysis, and compound identification, supporting concept mastery and high NEET scores. Use these chapterwise questions to measure your understanding and improve accuracy for NEET 2025.
What are MCQs for Purification and Characterisation of Organic Compounds?
MCQs on purification and characterisation of organic compounds test your grasp of methods such as distillation, sublimation, crystallisation, extraction, chromatography, and detection of elements. These are designed as per NEET patterns and help clarify theoretical and application-based knowledge crucial for medical entrance preparation.
Why Practice NEET MCQs?
Practicing NEET MCQs sharpens recall, boosts accuracy, and familiarizes you with typical exam question types on purification and characterisation. Regular MCQ practice highlights weak areas, aids in time management, and strengthens analytical skills, directly improving your NEET Chemistry performance.
Practice MCQs: Purification And Characterisation Of Organic Compounds
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Which method is preferred to purify an organic solid having high melting point and stable in air?
A. Sublimation
B. Distillation
C. Crystallisation
D. Chromatography
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Camphor is purified from an impure sample using:
A. Extraction
B. Sublimation
C. Distillation
D. Filtration
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Which test identifies nitrogen in an organic compound?
A. Dumas test
B. Molisch’s test
C. Ninhydrin test
D. Lassaigne’s test
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Steam distillation is used when a compound is:
A. Miscible with water
B. Soluble in organic solvents
C. Steam-volatile and immiscible with water
D. High-boiling and water soluble
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Separation of naphthalene from a mixture with sand is best done by:
A. Filtration
B. Sublimation
C. Distillation
D. Extraction
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Zone refining is suitable for:
A. Volatile liquids
B. Low-melting solids
C. Metals needing ultra-high purity
D. Azeotropic liquids
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Paper chromatography separates compounds on the basis of:
A. Solubility difference
B. Adsorption
C. Partition between solvents
D. Molecular weight
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The presence of halogens in an organic compound can be detected by:
A. Sodium fusion test
B. Tollen’s reagent
C. Barfoed’s test
D. Biuret test
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The best method for separating a volatile impure organic liquid is:
A. Simple distillation
B. Filtration
C. Sublimation
D. Crystallisation
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Elemental sulfur gets separated from sand by:
A. Extraction with CS2
B. Sublimation
C. Dissolving in water
D. Steam distillation
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Melting point of an impure solid is:
A. Higher than pure
B. Same as pure
C. Lower and broad
D. Always constant
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Organic compound decomposing below its boiling point is best purified by:
A. Simple distillation
B. Fractional distillation
C. Distillation under reduced pressure
D. Steam distillation
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Which of these is not a chromatographic technique?
A. Paper chromatography
B. Thin-layer chromatography
C. Column chromatography
D. Titration
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Removal of colored impurities from a solution is done by:
A. Using animal charcoal
B. Filtration
C. Using silica gel
D. Paper chromatography
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‘Mother liquor’ is the liquid:
A. Formed after distillation
B. Formed after extraction
C. Left after crystallisation
D. Used for chromatography
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Organic compounds with both high boiling and decomposition tendency are purified by:
A. Steam distillation
B. Distillation under reduced pressure
C. Crystallisation
D. Filtration
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Name the technique used to separate a mixture of two organic liquids differing by less than 10°C in boiling point:
A. Steam distillation
B. Fractional distillation
C. Simple distillation
D. Chromatography
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Instrument for measuring melting point accurately is called:
A. Melting tube
B. Thermocouple
C. Melting point apparatus
D. Fractional distillation
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Which is used as a drying agent for organic solvents like ether?
A. Anhydrous CaCl2
B. NaCl
C. ZnSO4
D. BaCl2
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The most advanced technique for purity checking of organic compounds is:
A. Melting point
B. Boiling point
C. Spectroscopy
D. Distillation
MCQ Answer Key
| Q.No. | Answer | Explanation |
|---|---|---|
| 1 | C | Crystallisation is ideal for pure, high-melting solids; impurities stay dissolved. |
| 2 | B | Camphor is volatile and sublimes directly on heating. |
| 3 | D | Lassaigne's test detects nitrogen using sodium fusion extract. |
| 4 | C | Steam distillation is for steam-volatile, water-immiscible compounds. |
| 5 | B | Naphthalene sublimes; sand does not, allowing separation. |
| 6 | C | Zone refining is used for metals needing extreme purity. |
| 7 | C | Paper chromatography uses partition between solvents. |
| 8 | A | Sodium fusion helps detect halogens in organics. |
| 9 | A | Simple distillation works for volatile liquids. |
| 10 | A | Sulfur dissolves in CS2, unlike sand. |
| 11 | C | Impure solid has lower, broad melting point due to impurities. |
| 12 | C | Reduced pressure distillation prevents decomposition when boiling. |
| 13 | D | Titration is not a chromatography technique. |
| 14 | A | Activated charcoal absorbs colored impurities efficiently. |
| 15 | C | Mother liquor is what remains after crystallization. |
| 16 | B | Pressure reduction lowers boiling, preventing decomposition. |
| 17 | B | Fractional distillation separates close-boiling liquids. |
| 18 | C | Melting point apparatus ensures accurate, sharp melting point detection. |
| 19 | A | Anhydrous CaCl2 absorbs moisture from solvents like ether. |
| 20 | C | Spectroscopy provides advanced, definite purity analysis. |
Explanations clarify reasoning behind each answer and help students understand important NEET concepts.
How These MCQs Help in NEET
These Purification And Characterisation Of Organic Compounds MCQ sharpen your technique identification and conceptual clarity. By solving these regularly, you learn NEET-style logic, avoid common traps, and recall facts quickly under pressure. Combine this with other chapterwise NEET Chemistry MCQs on Vedantu for all-round preparation.
Tips and Next Steps
- Review your attempt using the answer key for immediate feedback.
- Practice more NEET Chemistry MCQs using Vedantu’s chapterwise mock tests.
- Strengthen weaker subtopics by revisiting explanations before a full NEET mock.
- Attempt past NEET Chemistry papers at Vedantu for thorough exam practice.
- Revise allied chapters like Atomic Structure MCQ and Thermodynamics for cross-topic confidence.
Consistent MCQ practice in Purification And Characterisation Of Organic Compounds builds speed, accuracy, and confidence for NEET Chemistry. Use answer explanations to learn from mistakes and strengthen theory. Explore more chapterwise and full-length NEET Chemistry practice on Vedantu to maximize your exam score.
FAQs on Practice Purification And Characterisation Of Organic Compounds MCQ
1. Where can I get NEET MCQ practice for Purification and Characterisation of Organic Compounds?
You can find chapterwise NEET MCQ practice tests for Purification and Characterisation of Organic Compounds on trusted online platforms like Vedantu. These tests offer:
- Exam-patterned, chapterwise MCQs on purification, isolation, and qualitative analysis
- Instant answer keys and scoring
- Detailed solutions for each question
- Progress tracking and analytics to identify weak areas
- Accessible 24x7 for regular practice
2. How many questions are typically asked from this chapter in NEET Chemistry?
On average, 1-2 MCQs from Purification and Characterisation of Organic Compounds appear in the NEET Chemistry section each year. Key points:
- Questions usually focus on purification methods, qualitative analysis, and basic instrumental techniques
- Difficulty ranges from direct fact-based to application-based MCQ
- Practicing this chapter boosts your accuracy for compulsory topics
3. Are solutions and answer keys provided for every online test MCQ?
Yes, most reputable online NEET practice tests offer detailed answer keys and explanations for every MCQ. These include:
- Step-by-step reasoning for the correct answer
- Important NEET Chemistry concepts highlighted
- Quick references to commonly confused purification techniques
- Instant feedback on strengths and improvement areas
4. How do I check my scores and performance after the practice test?
After submitting your NEET Chemistry MCQ test online, you can view:
- Your total and section-wise score
- Breakdown of correct and incorrect answers
- Instant answer key with explanations
- Analytics showing time spent per question and topic-wise performance
- Suggestions on how to improve and track progress over time
5. Is the online MCQ test pattern similar to the actual NEET exam?
Yes, high-quality NEET online MCQ tests are designed to closely simulate the real exam pattern. They feature:
- Timed format and negative marking as per NEET guidelines
- NEET-relevant question types: factual, application, assertion-reason
- Difficulty levels matching the official exam
- Immediate, detailed solutions for quick revision
6. What is the best method to separate naphthalene from sodium chloride in a mixture?
The most effective way to separate naphthalene (a volatile solid) from sodium chloride (non-volatile) is by sublimation. This method:
- Heats the mixture gently
- Naphthalene vaporizes and is collected as crystals on a cold surface
- Sodium chloride remains as residue since it does not sublime
7. How do I avoid negative marking in NEET Chemistry MCQs?
To avoid negative marking in NEET Chemistry MCQs, follow these tips:
- Attempt only the questions you are confident about
- Read each MCQ and options carefully to prevent silly mistakes
- Review your answers before final submission
- Practice chapterwise timed tests to improve accuracy and speed
- Analyze previous errors using answer key explanations
8. What are common methods for purification of organic compounds covered in NEET?
Common purification methods in NEET Chemistry include:
- Crystallisation – for solid organic compounds
- Distillation (simple, fractional, steam) – for liquids with different boiling points
- Sublimation – for volatile solids
- Chromatography – for separation of mixtures
- Solvent extraction & chemical methods – for separating specific impurities
9. Which instrumental techniques are important for characterisation in NEET Chemistry?
In NEET Chemistry, the following instrumental techniques are key for characterisation of organic compounds:
- Melting point and boiling point determination
- Chromatography (paper, column, TLC)
- Basic spectroscopy principles (like UV/visible, for extra edge)
- Simple chemical tests for elemental analysis
10. What’s the most common mistake students make in Purification MCQs in NEET?
A frequent error in Purification MCQs is incorrectly matching the method to the type of compound or impurity. Key ways to avoid this:
- Review differences between sublimation, distillation, crystallisation, and chromatography
- Practice identifying when to use each technique
- Study past NEET and practice MCQs regularly
11. How can I use test analytics to improve my Chemistry NEET score?
Utilize your practice test analytics to boost your NEET Chemistry score by:
- Identifying weak areas based on incorrect answers
- Tracking time spent per question or section
- Noting patterns in mistakes (e.g., conceptual vs. calculation errors)
- Adjusting revision strategies for chapters with low accuracy
- Setting focused, time-bound practice goals
