Q. No.In thin layer chromatography, which of the following is not used to visualise the separated layer?
| 1. | Visualisation agent in the mobile phase |
| 2. | Spraying of suitable reagent |
| 3. | UV light |
| 4. | Solid I2 |
Subtopic: Purification of Organic Compounds |
Level 3: 35%-60%
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| Statement I: | A mixture of chloroform and aniline can be separated by simple distillation. |
| Statement II: | When separating aniline from a mixture of aniline and water by steam distillation aniline boils below its boiling point. |
The correct option is:
| 1. | Statement I is false but Statement II is true. |
| 2. | Both Statement I and Statement II are false. |
| 3. | Statement I is true but Statement II is false. |
| 4. | Both Statement I and Statement II are true. |
Subtopic: Purification of Organic Compounds |
67%
Level 2: 60%+
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The distillation technique most suited for separating glycerol from spent-lye in the soap industry is :
1. Steam distillation
2. Distillation under reduced pressure
3. Fractional distillation
4. Differential extraction
Subtopic: Purification of Organic Compounds |
86%
Level 1: 80%+
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The purification method of organic compound does not depend on :
1. Nature of compound
2. Shape of compound
3. Density of compound
4. Solubility of compound
1. Nature of compound
2. Shape of compound
3. Density of compound
4. Solubility of compound
Subtopic: Purification of Organic Compounds |
84%
Level 1: 80%+
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Which chromatographic technique is based on the principle of preferential adsorption?
1. A only
2. B only
3. C only
4. Both A and B
| (A) | Column chromatography |
| (B) | Thin layer chromatography |
| (C) | Paper chromatography |
2. B only
3. C only
4. Both A and B
Subtopic: Purification of Organic Compounds |
75%
Level 2: 60%+
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The technique used for purification of steam volatile water immiscible substance is :
1. Fractional distillation
2. Distillation under reduced pressure
3. Steam distillation
4. Simple distillation
1. Fractional distillation
2. Distillation under reduced pressure
3. Steam distillation
4. Simple distillation
Subtopic: Purification of Organic Compounds |
94%
Level 1: 80%+
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Phenol on reaction with dilute nitric acid, gives two products. Which method will be most efficient for large scale separation?
1. Chromatographic separation
2. Fractional crystallisation
3. Steam distillation
4. Sublimation
1. Chromatographic separation
2. Fractional crystallisation
3. Steam distillation
4. Sublimation
Subtopic: Purification of Organic Compounds |
77%
Level 2: 60%+
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Given below are two statements:
| Assertion (A): | A simple distillation can be used to separate a mixture of propanol and propanone. |
| Reason (R): | Two liquids with a difference of more than \(20^\circ C\) in their boiling points can be separated by simple distillation. |
| 1. | (A) is False but (R) is True. |
| 2. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 3. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
| 4. | (A) is True but (R) is False. |
Subtopic: Purification of Organic Compounds |
82%
Level 1: 80%+
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The metal that can be purified economically by fractional distillation method is:
1. \(\text{Cu}\)
2. \(\text{Zn}\)
3. \(\text{Fe}\)
4. \(\text{Ni}\)
1. \(\text{Cu}\)
2. \(\text{Zn}\)
3. \(\text{Fe}\)
4. \(\text{Ni}\)
Subtopic: Purification of Organic Compounds |
Level 3: 35%-60%
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Which purification technique is used for high boiling organic liquid compound (decomposes near its boiling point)?
1. Steam distillation
2. Fractional distillation
3. Simple distillation
4. Reduced pressure distillation
1. Steam distillation
2. Fractional distillation
3. Simple distillation
4. Reduced pressure distillation
Subtopic: Purification of Organic Compounds |
84%
Level 1: 80%+
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