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%

Subtopic:  Quantitative Analysis of Organic Compounds |
 77%
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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%

Subtopic:  Quantitative Analysis of Organic Compounds |
 75%
From NCERT
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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%

Subtopic:  Quantitative Analysis of Organic Compounds |
 76%
From NCERT
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Ether and benzene can be separated by-
1. Filtration
2. Distillation
3. Crystallization
4. Sublimation

Subtopic:  Quantitative Analysis of Organic Compounds |
 69%
From NCERT
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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 %

Subtopic:  Quantitative Analysis of Organic Compounds |
 75%
From NCERT
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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

Subtopic:  Qualitative Analysis of Organic Compounds | Quantitative Analysis of Organic Compounds |
 71%
From NCERT
AIPMT - 2011
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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

Codes

A B C D
1. 3 4 1 2
2. 1 2 3 4
3. 1 4 3 2
4. 4 1 3 2
Subtopic:  Quantitative Analysis of Organic Compounds |
 73%
From NCERT
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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

Subtopic:  Quantitative Analysis of Organic Compounds |
 66%
From NCERT
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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%

Subtopic:  Quantitative Analysis of Organic Compounds |
 73%
From NCERT
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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

Subtopic:  Quantitative Analysis of Organic Compounds |
 62%
From NCERT
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