In an estimation of sulphur by the carius method, 0.2175 g of the substance gave 0.5825 g of BaSO4 . The percentage composition of S in the compound is-

1. 66%

2. 20%

3. 37%

4.82%

Subtopic:  Quantitative Analysis of Organic Compounds |
 77%
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0.284 g of an organic substance gave 0.287 g AgCl in a carius method for the estimation of halogen. The percentage of Cl in the compound is-

1. 5%

2. 18%

3. 25%

4. 33%

Subtopic:  Quantitative Analysis of Organic Compounds |
 75%
From NCERT
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0.24 g of an organic compound containing phosphorous gave 0.66 g of Mg2P2O7 by the usual analysis. The percentage of phosphorous in the compound is-

1. 77%

2. 72%

3. 87%

4. 60 %

Subtopic:  Quantitative Analysis of Organic Compounds |
 61%
From NCERT
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0.1688 g organic compound when analyzed by the Dumas method yields 31.7 mL of moist nitrogen measured at 14º C, and 758 mm mercury pressure. The % of nitrogen in the organic compound (Aqueous tension at 14 º C =12 mm) is-

1. 30.9%

2. 10%

3. 40%

4. 21.9 %

Subtopic:  Quantitative Analysis of Organic Compounds |
 57%
From NCERT
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The latest technique for isolation, purification and separation of organic compounds is -

1. Crystallisation

2. Distillation

3. Sublimation

4. Chromatography

Subtopic:  Purification of Organic Compounds |
 73%
From NCERT
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The method that can be used to separate two compounds with different solubilities in a solvent is-
1. Distillation
2. Isolation
3. Fractional crystallization
4. Filtration

Subtopic:  Purification of Organic Compounds |
 65%
From NCERT
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Lassaigne's test can detect:

1. Nitrogen, Sulphur, Halogens

2. Nitrogen, Cyanides, Sulphur

3. Sodium, Sulphur, Halogens, Phosphorus

4. Nitrogen, Sulphur, Halogens, Phosphorus

Subtopic:  Qualitative Analysis of Organic Compounds |
 70%
From NCERT
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Halogen in an organic compound that can be detected by -

1. Duma's method 2. Carius method
3. Kjedahl's method 4. Chromatography
Subtopic:  Purification of Organic Compounds |
 74%
From NCERT
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Nitric acid is added to sodium extract before adding silver nitrate for testing halogens because:

1. Nitric acid reduces sulphide

2. Nitric acid decomposes NaCN and Na2S

3. Nitric acid oxidises the organic compound

4. Nitric acid acts as a dehydrating agent

Subtopic:  Qualitative Analysis of Organic Compounds |
 81%
From NCERT
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Metallic sodium is fused with organic compounds for testing nitrogen, sulphur, and halogens. The correct reason behind this is:

1. To convert all compounds to their ionic form.
2. Sodium reduces the compounds.
3. Sodium converts all compounds in their covalent form.
4. None of the above.
Subtopic:  Quantitative Analysis of Organic Compounds |
 70%
From NCERT
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