Q. No.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 |
The most suitable method used for the separation of 1:1 mixture of ortho and para-nitrophenols is:
| 1. | Chromatography | 2. | Crystallization |
| 3. | Steam distillation | 4. | Sublimation |
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
In Kjeldahl’s method for estimation of nitrogen present in the soil sample, ammonia evolved from 0.75g of sample neutralized 10ml. of 1M H2SO4. The percentage of nitrogen in the soil is:
| 1. | 37.33 | 2. | 45.85 |
| 3. | 25.75 | 4. | 43.13 |
| Assertion (A): | CCl4 doesn't give precipitate of AgCl on heating with AgNO3. |
| Reason (R): | CCl4 is a non-polar molecule. |
| 1. | (A) is true and (R) is the correct explanation of (A). |
| 2. | (A) is true but (R) is not the correct explanation of (A). |
| 3. | (A) is true but (R) is false. |
| 4. | Both (A) and (R) are false |
The Prussian blue colour obtained during the test of nitrogen by Lassaigne's test is due to the formation of-
| 1. | Fe4[Fe(CN)6]3 | 2. | Na3[Fe(CN)6] |
| 3. | Fe(CN)3 | 4. | Na4[Fe(CN)5NOS] |
0.2 g of an organic compound on complete combustion produces 0.44 g of CO2. The percentage of carbon is -
1. 50%
2. 60%
3. 70%
4. 80%
Lassaigne's test can detect:
1. Nitrogen, Sulphur, Halogens
2. Nitrogen, Cyanides, Sulphur
3. Sodium, Sulphur, Halogens, Phosphorus
4. Nitrogen, Sulphur, Halogens, Phosphorus
In sulphur estimation, 0.157 g of an organic compound gave 0.4813 g of barium sulphate. The percentage of sulphur in the compound is-
1. 39.10 %
2. 48.13 %
3. 42.10 %
4. 52. 43 %
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