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JEE Exam  >  JEE Test  >  Chemistry Main & Advanced  >  Test: Purification of Organic Compounds - JEE MCQ

Purification of Organic Compounds - Free MCQ Practice Test with solutions,


MCQ Practice Test & Solutions: Test: Purification of Organic Compounds (20 Questions)

You can prepare effectively for JEE Chemistry for JEE Main & Advanced with this dedicated MCQ Practice Test (available with solutions) on the important topic of "Test: Purification of Organic Compounds". These 20 questions have been designed by the experts with the latest curriculum of JEE 2026, to help you master the concept.

Test Highlights:

  • - Format: Multiple Choice Questions (MCQ)
  • - Duration: 20 minutes
  • - Number of Questions: 20

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Test: Purification of Organic Compounds - Question 1
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For the separation of two miscible liquids which method is used?

Detailed Solution: Question 1

Fractional distillation

Test: Purification of Organic Compounds - Question 2
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In Kjeldahl 's method, CuSO4 acts as

Detailed Solution: Question 2

Kjeldahl′s method depends upon the fact that most of the organic compounds containing nitrogen are quantitatively decomposed to give (NH4)2SO4 when heated strongly with conc. H2SO4. In this method CuSO4 acts as catalytic agent.

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Test: Purification of Organic Compounds - Question 3
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In Lassaigne's test, the organic compound is fused with a piece of sodium metal in order to

Detailed Solution: Question 3

To convert covalent compounds into ionic compounds such as NaCN,Na2 S,NaX, etc.

Test: Purification of Organic Compounds - Question 4
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A is a lighter phenol and B is an aromatic carboxylic acid. Separation of mixture of A and B can be carried out easily by using a solution of

Detailed Solution: Question 4

Carboxylic acids dissolve in sodium bicarbonate, while phenol does not.

Test: Purification of Organic Compounds - Question 5
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In Dumas method, 0.3 g of an organic compound gave 45 mL of nitrogen at STP. The percentage of nitrogen is

Detailed Solution: Question 5

In Dumes method,
% of nitrogen

Test: Purification of Organic Compounds - Question 6
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The Lassaigne's extract is boiled with dil. HNO3 before testing for halogens because

Detailed Solution: Question 6

Na2S and NaCN, formed during fusion with metallic sodium, must be removed before adding AgNO3, otherwise black ppt. due to Na2S or white precipitate due to AgCN will be formed and thus white precipitate of AgCl will not be identified easily.

Test: Purification of Organic Compounds - Question 7
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The best method for the separation of naphthalene and benzoic acid from their mixture is:

Detailed Solution: Question 7

Among the given compounds naphthelene is volatile but benzoic acid is non-volatile (it forms a dimer). So, the best method for their separation is sublimation,

Test: Purification of Organic Compounds - Question 8
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Aniline is usually purified by

Detailed Solution: Question 8

Aniline is miscible in steam and has b.p. lower than water, hence it is collected as distillate along with steam.

Test: Purification of Organic Compounds - Question 9
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Beilstein test is used for determination of

Detailed Solution: Question 9

Beilstein test – In this test organic compound is heated on a copper wire in a flame. The appearance of a green or bluish green flame due to the formation of volatile cupric halides indicate the presence of halogens in the organic compound. (It does not tell which halogen is actually present).

Test: Purification of Organic Compounds - Question 10
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2.79 g of an organic compound when heated in Carius tube with conc. HNO3 and H3PO4 formed is converted into MgNH4.PO4 ppt. The ppt. on heating gave 1.332 g of Mg2P2O7. The percentage of P in the compound is

Detailed Solution: Question 10

Percentage of

Test: Purification of Organic Compounds - Question 11
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If equivalent reacts with the given compound:

Choose the correct option:

Detailed Solution: Question 11


NaOH is base so it will react with acid.
H which is attached with -COOH is more acidic due to the stability of conjugate base (equivalent resonating structure). So, b and c is more basic. And in a and b, b is more acidic because it's conjugate base is stabilised due to -I effect of -NO2

Test: Purification of Organic Compounds - Question 12
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Find out the double bond equivalent (DBE) value of the given following compound:

Detailed Solution: Question 12

The double bond equivalent (DBE) value of the given compound is 11

Test: Purification of Organic Compounds - Question 13
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The prussian blue colour obtained during the test of nitrogen by Lassaigne's test is due to the formation of :

Detailed Solution: Question 13

Reaction takes place in Lassaigne's test are as:



So, is responsible for prussian blue colour obtained during the test of Nitrogen and Lassaigne test. O-nitrophenal is more volatile than pnitrophenal. There is intramolecular H - bonding in O- nitrophenal while in P- nitrophenal there is intermolecular hydrogen bonding which cause association of molecule. Intermolecular H - bondingincrease, boiling point increases while volatility reduces.

Test: Purification of Organic Compounds - Question 14
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The purification of naphthalene can be done by

Detailed Solution: Question 14

sublimation

Test: Purification of Organic Compounds - Question 15
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Two substances having slightly different solubility can be separated by

Detailed Solution: Question 15

fractional crystallization

Test: Purification of Organic Compounds - Question 16
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Which of the following statements is true regarding the fractional distillation of a mixture of two liquids?

Detailed Solution: Question 16

The distillate collected is the liquid of lower boiling point

Test: Purification of Organic Compounds - Question 17
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A compound which decomposes before its boiling point can be purified by the method of

Detailed Solution: Question 17

distillation under reduce pressure

Test: Purification of Organic Compounds - Question 18
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Phenol can be purified by the method of

Detailed Solution: Question 18

steam distillation

Test: Purification of Organic Compounds - Question 19
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Essential oils can be isolated by

Detailed Solution: Question 19

nan

Test: Purification of Organic Compounds - Question 20
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Chromatography is based on the phenomenon of

Detailed Solution: Question 20

adsorption

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This test contains 20 MCQs on Purification of Organic Compounds with detailed solutions for each question. It is part of the Chemistry for JEE Main & Advanced course on EduRev, designed to align with the current JEE syllabus. Each solution explains not just the correct answer but also gives you an understanding of the topic — not just to attempt the question but also help you prepare for the exam with practice.

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