1. | Dumas method | 2. | Carius method |
3. | Kjeldahl's method | 4. | Combustion method |
1. | 2. | ||
3. | 4. |
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 |
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 |
The Lassaigne’s extract is boiled with conc. while testing for halogens, because it:
1. Helps in the precipitation of
2. Increases the solubility product of
3. Increases the concentration of ions
4. Decomposes and , if formed