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1.

0.2 g of an organic compound on complete combustion produces 0.44 g of CO₂. The percentage of carbon is -
1. 50%
2. 60%
3. 70%
4. 80%

2.

In Kjeldahl's method, the nitrogen present is estimated as-
1. N₂ 
2. NH₃
3. NO₂ 
4 None of the above

3.

The Prussian blue colour obtained during the test of nitrogen by Lassaigne's test is due to the formation of-

1.	Fe4[Fe(CN)6]3	2.	Na3[Fe(CN)6]
3.	Fe(CN)3	4.	Na4[Fe(CN)5NOS]

4.

In Duma's method of estimation of nitrogen, 0.35 g of an organic compound gave 55 ml of nitrogen collected at 300 K temperature and 715 mm pressure. The percentage composition of nitrogen in the compound would be:
(Aqueous tension at 300 K = 15 mm)
1. 16.45
2. 27.45
3. 44.45
4. 35.45

5. 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

6.

The Lassaigne's extract is boiled with conc. HNO₃ while testing for halogens, because it- 

1.	Helps in the precipitation of AgCl
2.	Increases the solubility product of AgCl
3.	Increases the concentration of NO3- ions
4.	Decomposes Na2S and NaCN, if formed.

7.

Assertion (A):	CCl4 doesn't give precipitate of AgCl on heating with AgNO3.
Reason (R):	CCl4 is a non-polar molecule.

 

1.	Both (A) and (R) are True and (R) is the correct explanation of (A).
2.	Both (A) and (R) are True but (R) is not the correct explanation of (A).
3.	(A) is True but (R) is False.
4.	Both (A) and (R) are False.

8.

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 %

9.

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

1.	Crystallisation	2.	Distillation
3.	Sublimation	4.	Chromatography

10.

A mixture of calcium sulphate and camphor can be separated by: 
1. Filtration
2. Evaporation
3. Sublimation
4. Chromatography

11.

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 %

12.

In the Carius method, 0.468 grams of an organic sulphur compound gives 0.668 grams of barium sulphate. The percentage of sulphur in the given compound is:

1.	19.59%	2.	25.40%
3.	09.24%	4.	27.59%

13.

The purification method based on the difference in solubilities of the compound and the impurities in a solvent is -
1. Crystallisation
2. Distillation
3. Chromatography
4. Isolation

14.

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

15. During the hearing of a court case, the judge suspected that some changes in the documents had been carried out. He asked the forensic department to check the ink used at two different places. Which technique is most effective in providing the best results?
1. Column chromatography
2. Solvent extraction
3. Distillation
4. Thin layer chromatography

16.

Which principle does paper chromatography operate on?
1. Adsorption
2. Partition
3. Solubility 
4. Volatility

17.

Match Column I with Column II.

	Column I		Column II
A.	Dumas method	1.	AgNO3
B.	Kjeldahl’s method	2.	Silica gel
C.	Carius method	3.	Nitrogen gel
D.	Chromatography	4.	Ammonium sulphate

Choose the correct answer from the options given below:

	A	B	C	D
1.	3	4	1	2
2.	1	2	3	4
3.	1	4	3	2
4.	4	1	3	2

18.

Given below are two statements: 

Assertion (A):	Components of a mixture of red and blue inks can be separated by distributing the components between stationary and mobile phases in paper chromatography.
Reason (R):	The colored components of inks migrate at different rates because paper selectively retains different components according to the difference in their partition between the two phases.

 

1.	Both (A) and (R) are True and (R) is the correct explanation of (A).
2.	Both (A) and (R) are True but (R) is not the correct explanation of (A).
3.	(A) is True but (R) is False.
4.	(A) is False but (R) is True.

19.

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%

20.

In sulphur estimation, 0.157 g of an organic compound gave 0.4813 g of barium sulphate. The percentage of sulphur in the compound is:
1. 39.10 %
2. 48.13 %
3. 42.10 %
4. 52. 43 %