Principles Related to Practical Chemistry

A steam volatile organic compound which is immiscible with water has a boiling point of 250 C. During steam distillation, a mixture of this organic compound and water will boil :

1. above 100 C but below 250 C
2. above 250 C
3. at 250 C
4. close to but below 100 C

Match List-I with List-II : Choose the correct answer from the options given below :

1. A-IV, B-II, C-III, D-I
2. A-II, B-IV, C-III, D-I
3. A-II, B-III, C-IV, D-I
4. A-III, B-IV, C-II, D-I

Match List I with List II: Choose the correct answer from the options given below:

1. A-II, B-III, C-IV, D-I
2. A-IV, B-III, C-II, D-I
3. A-I, B-II, C-III, D-IV
4. A-II, B-III, C-I, D-IV

On complete combustion, 0.3 g of an organic compound gave 0.2 g of CO2 and 0.1 g of H2O. The percentage composition of carbon and hydrogen in the compound, respectively is:

1. 4.07% and 15.02%
2. 18.18% and 3.70%
3. 15.02% and 4.07%
4. 3.70% and 18.18%

In Lassaigne's extract of an organic compound, both nitrogen and sulphur are present, which gives blood red colour with Fe3+ due to the formation of-

1. NaSCN
2. [Fe(CN)5NOS]4-
3. [Fe(SCN)]2+
4. Fe4[Fe(CN)6]3 xH2O

The Kjeldahl's method for the estimation of nitrogen can be used to estimate the amount of nitrogen in which one of the following compounds?

1. [figure]
2. [figure]
3. [figure]
4. [figure]

Paper chromatography is an example of :

1. Partition chromatography
2. Thin layer chromatography
3. Column chromatography
4. Adsorption chromatography

The most suitable method of separation of 1 : 1 mixture of ortho and para-nitrophenols is

1. chromatography
2. crystallisation
3. steam distillation
4. sublimation.

In Dumas method for estimation of nitrogen, 0.25 g of an organic compound gave 40 mL of nitrogen collected at 300 K temperature and 725 mm pressure. If the aqueous tension at 300 K is 25 mm, the percentage of nitrogen in the compound is

1. 16.75
2. 15.76
3. 17.36
4. 18.20

In the Kjeldahl's method for estimation of nitrogen present in a soil sample, ammonia evolved from 0.75 g of sample neutralized 10 mL of 1 M H2SO4. The percentage of nitrogen in the soil is

1. 37.33
2. 45.33
3. 35.33
4. 43.33