0.26 g of an organic compound gave 0.039 g of water and 0.245 g of carbon dioxide on combustion. The percentage of C in the organic compound is-
1. 35%
2. 25%
3. 2%
4. 90%
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%
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%
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 %
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 %
The latest technique for isolation, purification and separation of organic compounds is -
1. | Crystallisation | 2. | Distillation |
3. | Sublimation | 4. | Chromatography |
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
Lassaigne's test can detect:
1. Nitrogen, Sulphur, Halogens
2. Nitrogen, Cyanides, Sulphur
3. Sodium, Sulphur, Halogens, Phosphorus
4. Nitrogen, Sulphur, Halogens, Phosphorus
Halogen in an organic compound that can be detected by -
1. | Duma's method | 2. | Carius method |
3. | Kjeldahl's method | 4. | Chromatography |
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