0.1688 g organic compound when analyzed by the Dumas method yields 31.7 mL of moist nitrogen measured at 14º C and 758 mm mercury pressure. The % of the nitrogen in the organic compound (Aqueous tension at 14 º C =12 mm) is:

1. 30.9%

2. 10%

3. 40%

4. 21.9 %

Find the percentage of nitrogen in an organic compound from the following Kjeldahl’s method data:
0.6 g compound was Kjeldahlised. NH₃ evolved was absorbed in 50 mL of semi-normal H₂SO₄.
The remaining acid was diluted to 150 mL. 20 mL of this diluted solution required 35 mL of N/20 NaOH for neutralisation.

1. 24.2% 

2. 32.4%

3.27.6 %

4. 20.8%

Which of the following is responsible for the Prussian blue colour in Lassaigne’s test for nitrogen?:

$1.<mspace\; width="1em"></mspace>{\mathrm{Na}}_4\left[\mathrm{Fe}{\left(\mathrm{CN}\right)}_6\right]<mspace\; width="1em"></mspace>$
$2.<mspace\; width="1em"></mspace>{\mathrm{Fe}}_4[\mathrm{Fe}{\left(\mathrm{CN}\right)}_6{]}_3$
$3.<mspace\; width="1em"></mspace>{\mathrm{Fe}}_2\left[\mathrm{Fe}{\left(\mathrm{CN}\right)}_6\right]<mspace\; width="1em"></mspace>$
$4.<mspace\; width="1em"></mspace>{\mathrm{Fe}}_3[\mathrm{Fe}{\left(\mathrm{CN}\right)}_6{]}_4$

The latest technique for isolation, purification and separation of organic compounds is -

IUPAC name of the given compound is :

1. 3-Phenylpropane

2. Phenyl-1-butane

3. 2-Benzylethane

4. Propyl benzene

The method that can be used to separate two compounds with different solubilities in a solvent is-
1. Distillation
2. Isolation
3. Fractional crystallization
4. Filtration

Which purification method is suitable for a liquid that decomposes upon boiling?

1. Fractional distillation  
2. Steam distillation
3. Simple distillation 
4. Distillation under reduced pressure

Find the elements that can be detected by Lassaigne's test

1. Nitrogen, Sulphur, Halogens

2. Nitrogen, Cyanides, Sulphur

3. Sodium, Sulphur, Halogens, Phosphorus

4. Nitrogen, Sulphur, Halogens, Phosphorus

Halogen in an organic compound that can be detected by -