On complete combustion, 0.246 g of an organic compound gave 0.198g of carbon dioxide
and 0.1014g of water. What is the calculated percentage composition of carbon and
hydrogen in the compound?

1. 21.95 %; 4.58 %
2. 33.46 %; 3.14 %
3. 42.15 %; 2.61 %
4. 25.24 %; 3.98 %

What is the percentage composition of nitrogen in the compound if in dumas’ method for estimation of nitrogen, 0.3 g of an organic compound gave 50 mL of nitrogen collected at 300 K temperature and 715 mm pressure?

[Given: Aqueous tension at 300 K=15 mm]

1. 21.43%

2. 25.13%

3. 19.46%

4. 17.46%

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%

What is the calculated bromine percentage in the Carius method for 0.15 g of an organic compound
producing 0.12 g of AgBr?
 

1. 39.05 %

2. 42.42 %

3. 34.04%

4. 65.12 %