The fractional distillation is used in
Crude oil
Coal tar
Petroleum
All of these
On ignition, 0.3585 g of platinum, 0.98 g of the platinichloride of diacid base left. The molecular weight of the base is
70
90
109
123
In an experiment, 0.236 g of an organic compound gave on combustion 0.352 g of carbon dioxide and 0.108 g of water. The simplest formula of the compound is
CH3O
CH2O
C2H3O2
C2H2O2
Anthraquinone is purified by
Distillation
Sublimation
Crystallisation
Chromatography
When a solid is heated with fusion mixture of sodium carbonate and potassium nitrate, a yellow precipitate is obtained. It indicates the presence of
Na
Cl
S
P
Which of the following method is used to estimate nitrogen in the laboratory ?
Carius method
Duma’s method
Liebig’s method
Kjeldahl’s method
What is the molecular formula of a compound, if its empirical formula is CH2O and its molecular weight is 90?
C2H6O2
C6H6O3
C3H6O3
C4H8O4
The best method for the separation of naphthalene and benzoic acid from their mixture is
On combustion, 0.2 g of an organic compound containing carbon, hydrogen and oxygen yields 0.147 g carbon dioxide and 0.12 g water. The percentage of carbon, hydrogen and oxygen respectively in the compound are
20, 6.7 and 73.3
22.5, 8.7 and 68.8
18.2, 9.5 and 72.3
28.6, 12.8 and 58.8
The empirical formula of a compound is CH2O. If its vapour density is 90, then the molecular formula of the compound is
C5H10O5
C6H12O6
