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
Method that can be used to purify the liquid that decomposes on boiling is :
1) Fractional distillation
2) Distillation under reduced pressure
3) Steam distillation
4) Distillation
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. | Kjedahl'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
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. |
A mixture of calcium sulphate and camphor can be separated by-
1. Filtration
2. Evaporation
3. Sublimation
4. Chromatography
A gas among the following that can be absorbed by potassium hydroxide is -
1. | Carbon dioxide | 2. | Silicon dioxide |
3. | Hydrogen | 4. | Carbon monoxide |
0.3780 grams of an organic chloro compound gave 0.5740 grams of silver chloride in Carius
estimation. % of chlorine present in the compound is -
1. 25%
2. 37.59%
3. 42%
4. 05.70 %
In the Carius method, 0.468 grams of an organic sulphur compound gives 0.668 grams of barium sulphate. The percentage of sulphur in the given compound is -
1. 19.59%
2. 25.40%
3. 09.24%
4. 27.59%