JEE Main Chemistry - Purification and Characteristics of Organic Compounds
Exam Duration: 60 Mins Total Questions : 30
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
An organic compound contains 60% carbon,13.3% hydrogen and rest oxygen.The emprical formula of the compound is
- (a)
C3H8O
- (b)
C4H7O2
- (c)
C2H6O
- (d)
C2H5O2
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
Distillation is a Process Which involves
- (a)
eveporation
- (b)
condensation
- (c)
evaporation followed by condensation
- (d)
neither evaporation nor condensation
If two liquids hve widely different boiling points they may be seperated by
- (a)
distillation
- (b)
steam distillation
- (c)
sublimation
- (d)
evaporation
A mixture of two inniscible liquids may be easily seperated into its components by uing a
- (a)
Seperating funnel
- (b)
liebigs condenser
- (c)
Distillation flask
- (d)
steam distillation apparatus
Prussion blue is
- (a)
K3[Fe(CN6)]
- (b)
K(Fe[Fe(CN)6])
- (c)
K2[Fe(Fe(CN)6])
- (d)
K4[Fe(Fe(CN)6]
How many grams H2SO4 are present in. 25 g moles of H2SO4?
- (a)
24.5 g
- (b)
2.45 g
- (c)
.25 g
- (d)
1.245 g
An analysis of organic compound gave 74% C,8.65% H and 17.3% N. Its empirical formula is
- (a)
C5H8N
- (b)
C10H12N
- (c)
C5H7N
- (d)
C10H14N
A compound containing 80% carbon, 20% H is likely to be
- (a)
C2H6
- (b)
C2H5OH
- (c)
C2H6
- (d)
CHCL3
A baser is diacidic. 0.98 g of its chloroplatinate on heating left a residue of 0.39 g platinum.The moleculer mass of the base is
- (a)
60
- (b)
70
- (c)
80
- (d)
100
Chlorine in organic compound is estimated by
- (a)
Kjeldahl's method
- (b)
Carius method
- (c)
Direct argentiometry
- (d)
High pressure liquid chromatography
If 0.24 g of a volatile liquid upon vaporisation gives 45 ml of vapours at NTP,what will be the vapour density of the sudstance?
(Density of H2=0.089 gL_1)
- (a)
95.39
- (b)
5.993
- (c)
95.93
- (d)
56.0
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 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
The purity of an organic compound is determind by
- (a)
Density
- (b)
melting point
- (c)
melting point
- (d)
moleculer weight
Chloroform and Benzene form a pair of miscible liquids. These can be seperated by
- (a)
Sublimation
- (b)
Filteration
- (c)
a seperating funnel
- (d)
distillation
When petroleum is heated gradually, first batch of vapours evolved will be rich in
- (a)
Kerosene
- (b)
Petroleum ether
- (c)
Diesel
- (d)
lubricating oil
The sinplest formula of a compound containing 50% of element X (at. wt. 10) and 50% of element Y (at. Wt. 10) is
- (a)
XY
- (b)
XY2
- (c)
X2Y
- (d)
X2Y32
If 0.32 g of an organic compound containing sulphur produces 0.233 g of BaSO4, then the percentage of sulphur in it is
- (a)
10
- (b)
15
- (c)
20
- (d)
25
In carius tube the compound CLCH2-COOH was heated with furning HNO3 and AgNO3.After filteration and washing, a precipitate was formed. The precipiate is :
- (a)
AgCL
- (b)
AgNO3
- (c)
Ag2SO4
- (d)
CH2(CL)COO Ag
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
An organic substance from its aqueous solution can be seperated by
- (a)
Distillation
- (b)
Steam distillation
- (c)
Solvent extraction
- (d)
Fractional distillation
Positive Belistein test shows that
- (a)
halogen is urely present
- (b)
halogen is absent
- (c)
halogen may be present
- (d)
NONE OF THESE
Copper wire test is called
- (a)
Dumas test
- (b)
Leibig test
- (c)
Beilstein's test
- (d)
Fusion test
Air contains 20% O2 by volume. The volume of air that will be required for 100cc of acetylene is
- (a)
1250cc
- (b)
1064cc
- (c)
212.8 cc
- (d)
500 cc
Which one of the following compounds cannot be formed on the fusion of thiourea with metallic sodium?
- (a)
Na2S
- (b)
NaCNS
- (c)
NaCN
- (d)
Na2SO4
The compound ClCH2COOH was heated with fuming HNO3 and AgNO3 in a Carius tube. A white precipitate is formed after filteration and washing of the reaction mixture. The white precipitate formed is
- (a)
Ag2SO4
- (b)
AgNO3
- (c)
ClCH2COOAg
- (d)
AgCl
In an organic compound of molar mass 108 g mol-1 C, H and N atoms are present in 9:1:3.5 by weight. The molecular formula of the compound can be
- (a)
C3H6N2
- (b)
C6H8N2
- (c)
C5H6N3
- (d)
C4H12N2