Principles Related to Practical Chemistry · Question 15

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

Nitrogen detection in an organic compound is carried out by Lassaigne's test. The blue colour formed corresponds to which of the following formulae?

1. Fe3[Fe(CN)6]2
2. Fe4[Fe(CN)6]3
3. Fe4[Fe(CN)6]2
4. Fe3[Fe(CN)6]3

The Lassaigne's extract is boiled with conc. HNO3 while testing for halogens. By doing so it

1. decomposes Na2S and NaCN, formed
2. helps in the precipitation of AgCl
3. increases the solubility product of AgCl
4. increases the concentration of NO3- ions