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%

0.26 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%

Ether and benzene can be separated by-
1. Filtration
2. Distillation
3. Crystallization
4. Sublimation

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 %

The Lassaigne’s extract is boiled with conc. ${\mathrm{HNO}}_3$ while testing for halogens, because it:

1. Helps in the precipitation of $\mathrm{AgCl}$
2. Increases the solubility product of $\mathrm{AgCl}$
3. Increases the concentration of ${\mathrm{NO}}_3^{-}$ ions
4. Decomposes ${\mathrm{Na}}_2\mathrm{S}$ and $\mathrm{NaCN}$, if formed

Match Column I with Column II.

Codes

The fragrance of flowers is due to the presence of some steam volatile organic compounds called essential oils. These are generally insoluble in water at room temperature but are miscible with water vapor in the vapor phase. A suitable method for the extraction of these oils from the flowers is

1.  Distillation

2.  Crystallisation

3.  Distillation under pressure

4.  Steam distillation

During estimation of nitrogen present in an organic compound, the ammonia evolved from 0.5 g of the compound in Kjeldahl’s estimation of nitrogen, neutralized 10 mL of 1 M H₂SO₄. The percentage of nitrogen in the compound is-

1. 46.0 %

2. 51.0%

3. 56.0%

4. 49.0%

An organic compound contains 69% carbon, and 4.8% hydrogen, the remainder being
oxygen. The masses of carbon dioxide, and water produced when 0.20 g of this substance is subjected to complete combustion would be respectively -

1. 0.506 g , 0.0864 g

2. 0.906 g , 0.0864 g

3. 0.0506 g , 0.864 g

4. 0.0864 g, 0.506 g