Chemistry - Purification and Characteristics of Organic Compounds
Exam Duration: 45 Mins Total Questions : 30
The elements of nitrogen and ulphur are present in an organic compound.which of the sodium compounds(is/are)present in the sodium extract on fusing it with sodium?
- (a)
thicocyante
- (b)
cyanide and sulphide
- (c)
sulphite and cyanide
- (d)
nitrate and cyanide
The volume of co2 evoled on complete combustion of 1 mole of ethylene in excess oxygen in litres is
- (a)
22.4
- (b)
44.8
- (c)
2.24
- (d)
NONE OF THESE
on complete combustion of 1 mole of C3H6 with excess of oxygen the water formed in moles is
- (a)
2
- (b)
3
- (c)
4
- (d)
NONE OF THESE
An organic compound is found to contain C=39.9%,H=6.7%,O=53.4%. Its empirical formula is
- (a)
CHO
- (b)
CHO2
- (c)
CH2O2
- (d)
CH2O
Which of the following is blood red compound in quantitative estimation of nitrogen and sulphur together?
- (a)
Fe4[Fe(CN)6]3
- (b)
Fe(SCN)3
- (c)
FeSCN
- (d)
NA2S,NACN
A mixture of water and alcohol can be seperated by
- (a)
eveporation
- (b)
decantation
- (c)
titration
- (d)
fractional distillation
Distillation is a Process Which involves
- (a)
eveporation
- (b)
condensation
- (c)
evaporation followed by condensation
- (d)
neither evaporation nor condensation
A compound contains 38.8% carbon, 16% hydrogen and 45.2% nitrogen.The formula of the compound would be
- (a)
CH3NH2
- (b)
C2H5NH2
- (c)
CH3CN
- (d)
CH2(NH2)2
Fractional crystalliation is carried out to seperate a mixture such as
- (a)
organic solids mixed in inorganic solide
- (b)
organic solids highly soluble in water
- (c)
organic solids having small difference in their solubilities in suitable solvant
- (d)
organic solids having great difference in their solubilities in suitable solvents
The empirical formula of a compound is CH2, 1 mole of the compound has mass 14 g.its moleculer formula is
- (a)
CH2
- (b)
C2H4
- (c)
C3H8
- (d)
C3H6
If 22 g of a substance when vaporised isCH2, 1 mole of the compound has mass 14 g.Its moleculer formula is
- (a)
CH2
- (b)
C2H4
- (c)
C3H8
- (d)
C3H6
An organic compound contains 8 percent ozygen.its minimum moleculer weight would be
- (a)
100
- (b)
200
- (c)
300
- (d)
400
The silver salt of an organic acid contain 64.67% Ag. The mol wt. of the silver salt(At.Wt.of Ag=108)
- (a)
153
- (b)
167
- (c)
181
- (d)
195
The compound that does not give a blue colour in Lassagne's test is
- (a)
Aniline
- (b)
Glycine
- (c)
Hydrazine
- (d)
Urea
An organic compound containing C,H and L gave the following analysis:C=40%,H=13.33%,n=46.67% What Would be its empirical formula?
- (a)
C2H7N
- (b)
C2H7N2
- (c)
CH4N
- (d)
CH5N
A mixture contains four solid organic compounds A,B,C and D.on heating only C changes from solid to vapour state.C can be seperated from the rest in the mixture by
- (a)
distillation
- (b)
sublimation
- (c)
fractional distillation
- (d)
crystallisation
In Kjeldahl's method, the nitrogen presence is estimated as
- (a)
N2
- (b)
NH3
- (c)
NO2
- (d)
N2O3
Duma's method involves the determination of content of nitrogen in the organic compound in the form of
- (a)
Gaseous NH3
- (b)
Gaseous N2
- (c)
NaCN
- (d)
(NH4)2SO4
A dibasic acid containing C,H and O Was found to contain C = 26.7% and H = 2.2%. The vapour density of diethyl ester was found to be 73. What is moleculer formula of acid?
- (a)
CH2O2
- (b)
C2H2O4
- (c)
C3H3O4
- (d)
C4H4O4
During Lassaigne' test, N and S present in an orgnic compound change into
- (a)
NA2S and NACN
- (b)
NaSCN
- (c)
Na2SO4 and NACN
- (d)
NA2s and NACNO
When petroleum is heated gradually, first batch of vapours evolved will be rich in
- (a)
Kerosene
- (b)
Petroleum ether
- (c)
Diesel
- (d)
lubricating oil
In a Lassigne's test for sulphur in the organic compound with sodium nitroprusside solution the purple colour formed is due to
- (a)
Na4[Fe(CN)5NOS]
- (b)
Na3[Fe(CN)5S]
- (c)
Na2[Fe(CN)5NOS]
- (d)
Na3[Fe(CN)6].
A gaseous hydrocarbon has 85% carbon and vapour density of 28. The possible formula of the hydrocarbon will be
- (a)
C3H6
- (b)
C2H4
- (c)
C2H2
- (d)
C4H8
The following is the percentage composition of a compound Na = 16.08%,c = 4.19%,O = 16.78% and H2O = 62.95%.Its moleculer formula is:
- (a)
Na2CO3
- (b)
Na2CO3.H2O
- (c)
Na2CO3.10H2O
- (d)
Na2CO3.5H2O
59 g og an amide obtained from a carboxylic acid,RCOOH, upon heating with alkali liberated 17 g of ammonia. The acid is
- (a)
Formic acid
- (b)
Acetic acid
- (c)
Propionic acid
- (d)
Benzoic acid
Chromatography is used for the purification of
- (a)
Solids
- (b)
Gases
- (c)
Liquids
- (d)
ALL THE ABOVE
The addition of sodium nitroprusside solution to the Lassaigne's solution produces violet colouration. This signifies the presence of
- (a)
nitrogen
- (b)
sulphur
- (c)
chlorine
- (d)
phosphorus
The formation of a yellow precipitate by the addition of solution of ammonium molybdate to the sodium extract of an organic compound confirms the presence of
- (a)
chlorine
- (b)
sulphur
- (c)
phosphorus
- (d)
nitrogen
When FeCl3 is added to the sodium extract of an organic compound containing both N and S, the red colored precipitate is formed due to the formation of
- (a)
[Fe(CN)6]3-
- (b)
[Fe(CNS)]2+
- (c)
[Fe(CNS)2]+
- (d)
[Fe(CN)6]4-
In the Lassaigne's test for nitrogen in an organic compound, the Prussian blue colour is obtained due to the formation of
- (a)
Na4[Fe(CN)6]
- (b)
Fe4[Fe(CN)6]3
- (c)
Fe2[Fe(CN)6]
- (d)
Fe3[Fe(CN)6]4