Nitric acid is added to sodium extract before adding silver nitrate for testing halogens because:

1. Nitric acid reduces sulphide

2. Nitric acid decomposes NaCN and Na2S

3. Nitric acid oxidises the organic compound

4. Nitric acid acts as a dehydrating agent

Subtopic:  Qualitative Analysis of Organic Compounds |
 81%
From NCERT
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In Kjeldahl’s method for estimation of nitrogen present in the soil sample,
ammonia evolved from 0.75g of sample neutralized 10ml. of 1M H2SO4.
The percentage of nitrogen in the soil is:

1. 37.33 2. 45.85
3. 25.75 4. 43.13
Subtopic:  Qualitative Analysis of Organic Compounds |
 72%
From NCERT
AIPMT - 2014
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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]
Subtopic:  Qualitative Analysis of Organic Compounds |
 73%
From NCERT
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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%

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

Subtopic:  Qualitative Analysis of Organic Compounds |
 65%
From NCERT
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