thefunalways.com – MCQs, Mock Tests | IIT JEE IIT JEE Purification Of Organic Compounds .

1 A substance which decomposes below it s boiling point can be best purified by

A Simple distillation B Steam distillation C Fractional distillation D Distillation under reduced pressure.

✅ Correct Answer: 4

2 0.1914g of a monobasic organic acid is dissolved in about 20 mL of water 25 mL of 0.12 M NaOH is required for complete neutralization of the acid solution. The molar mass of the acid is65.0

A 65 B 64 C 62.5 D 63.8.

✅ Correct Answer: 4

3 The boiling point of a compound does not depend upon

A Solubility of the compound in water B Hydrogen bonding C Size of molecules D Polarity of the molecule.

✅ Correct Answer: 1

4 A mixture of camphor and benzoic acid can be separated by which of the following technique?

A Chemical methods B Sublimation C Fractional distillation D Extraction with a solvent.

✅ Correct Answer: 1

5 A mixture of acetone and methanol can be separated by

A Vacuum distillation B Steam distillation C Fractional distillation D Simple distillation.

✅ Correct Answer: 3

6 The purification of benzeneamine is done by

A Steam distillation B Chromatographic techniques C Fractional crystallisation D By adding oxalic acid.

✅ Correct Answer: 1

7 By decreasing the pressure the boiling point of a liquid

A Increases B Decreases C Remains constant D May increases or decrease.

✅ Correct Answer: 2

8 Sublimation cannot be used for purification of

A Naphthalene B Camphor C Benzoic acid D Urea.

✅ Correct Answer: 4

9 0.532 g of the chloroplatinate of an organic base (mol. Mass 264) gave 0.195 g Pt on ignition. Then the number of nitrogen atoms per molecule of the base is

A 1 B 2 C 3 D 4

✅ Correct Answer: 4

10 In Lassaignes test the organic compound is fused with a piece of sodium metal in order to

A increase the ionization of the compound B decrease the melting point of the compound C increase the reactivity of the compound D convert the covert the covalent compound into a mixture of ionic compounds.

✅ Correct Answer: 4

11 The formation of violet colour when sodium nitroprusside is added to sodium extract indicates the presence of.

A Nitrogen B Sulphur C Oxygen D Halogens

✅ Correct Answer: 2

12 The Beilsteins test is a rapid test used for organic compounds to detectSulphur

A Phosphorus B Sulphur C Halogens D Nitrogen.

✅ Correct Answer: 1

13 When a solid vapourize directly without melting the process is calledEvaporation

A Evaporation B Sedimentation C Saponification D Sublimation.

✅ Correct Answer: 4

14 In paper chromatography

A the mobile phase is a liquid and the stationary phase is a solid B the mobile phase is a solid and the stationary phase is a liquid C both phases are liquids D both phases are solids.

✅ Correct Answer: 3

15 A mixture of benzoic acid and naphthalene can be separated by crystallization from

A Hot water B Cold water C Benzene D Ether.

✅ Correct Answer: 1

16 Chromatographic technique was introduced by

A Duma (1803) B Kjeldhl (1903) C Tswett (1906) D Lavosier.

✅ Correct Answer: 3

17 Naphthalene can be purified by

A Sublimation B Crystallization C Extraction with a solvent D Distillation.

✅ Correct Answer: 1

18 Sugar containing an impurity of common salt can be purified by crystallization from

A Benzene B Ethanol C Petroleum ether D Water.

✅ Correct Answer: 2

19 A mixture of o-hydroxyacetophenone and hydroxyacetophenone can be separated by.

A Sublimation B Steam distillation C Fractional crystallization D Distillation

✅ Correct Answer: 2

20 Separation of two substances by fractional crystallisation depends upon their difference inMelting point

A Densities B Solubilities C Melting point D Boiling points.

✅ Correct Answer: 2

21 The formation of violet colour when sodium nitroprusside is added to sodium extract indicates the presence of

A Nitrogen B Sulphur C Oxygen D Halogens.

✅ Correct Answer: 2

22 The Beilsteins test is a rapid test used for organic compounds to detect

A Phosphorus B Sulphur C Halogens D Nitrogen.

✅ Correct Answer: 1

23 When a solid vapourize directly without melting the process is called

A Evaporation B Sedimentation C Saponification D Sublimation.

✅ Correct Answer: 4

24 Naphthalene can be purified by

A Sublimation B Crystallization C Extraction with a solvent D Distillation.

✅ Correct Answer: 10

25 A mixture of o-hydroxyacetophenone and hydroxyacetophenone can be separated by

A Sublimation B Steam distillation C Fractional crystallization D Distillation.

✅ Correct Answer: 2

26 Separation of two substances by fractional crystallisation depends upon their difference inBoiling points.

A Densities B Solubilities C Melting point D Boiling points.

✅ Correct Answer: 2

27 Which of the following element s in an organic compound cannot be detected by Lassaignes test?

A N B S C Cl D H.

✅ Correct Answer: 4

28 The separation an organic compound from it s aqueous solution can be achieved by:Steam distillation

A Distillation B Steam distillation C Solvent extraction D Fractional distillation.

✅ Correct Answer: 3

29 0.59 g of the silver salt of an organic acid (mol. Mass 210) on ignition gave 0.36 of pure silver. The basicity of the acid is1234.

A 1 B 2 C 3 D 4

✅ Correct Answer: 3

30 In steam distillation the sum of the vapour pressure of the volatile compound and that of water is

A equal to atmospheric pressure B less than atmospheric pressure C more than atmospheric pressure D exactly half of the atmospheric pressure.

✅ Correct Answer: 1

31 The separation of the constituents of a mixture by column chromatography depends upon their

A Different solubilities B Different boiling points C Different refractive indices D Differential adsorption.

✅ Correct Answer: 4

32 Refining of petroleum involves the process ofFractional distillation

A Simple distillation B Fractional distillation C Steam distillation D Distillation under reduced pressure.

✅ Correct Answer: 2

33 The technique of gas chromatography is suitable for compounds which

A are liquids B have very low boiling points C are soluble in water D vapourize without decomposition.

✅ Correct Answer: 4

34 Steam distillation is used for the extraction of

A Essential oils B Higher alkynes C Mineral oils D Fatty acids.

✅ Correct Answer: 1

35 A compound which does not give a positive test in the Lassaignes test for nitrogen isUrea

A Urea B Hydroxyl amine C Glycine D Phenylhydrazine.

✅ Correct Answer: 2

36 Haemoglobin contains 0.33% of iron by mass. The molecular mass of haemoglobin is approximately 67200. The number of iron atoms [at. mass Fe = 56] present is one molecule of haemoglobin is6142.

A 6 B 1 C 4 D 2

✅ Correct Answer: 3

37 An organic compound having carbon hydrogen and sulphur contains 4% of sulphur. The minimum molecular mass of the compound is

A 200 B 400 C 600 D 800

✅ Correct Answer: 4

38 Certain organic compound contains 10% of sulphur is it. Which of the following represent the minimum molecular mass of the compound

A 320 B 160 C 400 D 200

✅ Correct Answer: 1

39 The chloroplatinate of an organic base contains 39% of Pt. The equivalent mass of the base is

A 73 B 59 C 65 D 45

✅ Correct Answer: 4

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IIT JEE Purification Of Organic Compounds .