0.1914g of a monobasic organic acid is dissolved in about 20 mL of water 25 mL of 0.12 M NaOH is required for complete neutralization of the acid solution. The molar mass of the acid is65.0
1.65
2.64
3.62.5
4.63.8.
0.532 g of the chloroplatinate of an organic base (mol. Mass 264) gave 0.195 g Pt on ignition. Then the number of nitrogen atoms per molecule of the base is
1.1
2.2
3.3
4.4
0.59 g of the silver salt of an organic acid (mol. Mass 210) on ignition gave 0.36 of pure silver. The basicity of the acid is1234.
1.1
2.2
3.3
4.4
A compound which does not give a positive test in the Lassaignes test for nitrogen isUrea
1.Urea
2.Hydroxyl amine
3.Glycine
4.Phenylhydrazine.
A mixture of acetone and methanol can be separated by
1.Vacuum distillation
2.Steam distillation
3.Fractional distillation
4.Simple distillation.
A mixture of benzoic acid and naphthalene can be separated by crystallization from
1.Hot water
2.Cold water
3.Benzene
4.Ether.
A mixture of benzoic acid and naphthalene can be separated by crystallization from
1.Hot water
2.Cold water
3.Benzene
4.Ether.
A mixture of camphor and benzoic acid can be separated by which of the following technique?
1.Chemical methods
2.Sublimation
3.Fractional distillation
4.Extraction with a solvent.
A mixture of o-hydroxyacetophenone and hydroxyacetophenone can be separated by
1.Sublimation
2.Steam distillation
3.Fractional crystallization
4.Distillation.
A mixture of o-hydroxyacetophenone and hydroxyacetophenone can be separated by.
1.Sublimation
2.Steam distillation
3.Fractional crystallization
4.Distillation
A substance which decomposes below it s boiling point can be best purified by
1.Simple distillation
2.Steam distillation
3.Fractional distillation
4.Distillation under reduced pressure.
An organic compound having carbon hydrogen and sulphur contains 4% of sulphur. The minimum molecular mass of the compound is
1.200
2.400
3.600
4.800
By decreasing the pressure the boiling point of a liquid
1.Increases
2.Decreases
3.Remains constant
4.May increases or decrease.
Certain organic compound contains 10% of sulphur is it. Which of the following represent the minimum molecular mass of the compound
1.320
2.160
3.400
4.200
Chromatographic technique was introduced by
1.Duma (1803)
2.Kjeldhl (1903)
3.Tswett (1906)
4.Lavosier.
Chromatographic technique was introduced by
1.Duma (1803)
2.Kjeldhl (1903)
3.Tswett (1906)
4.Lavosier.
Haemoglobin contains 0.33% of iron by mass. The molecular mass of haemoglobin is approximately 67200. The number of iron atoms [at. mass Fe = 56] present is one molecule of haemoglobin is6142.
1.6
2.1
3.4
4.2
In Lassaignes test the organic compound is fused with a piece of sodium metal in order to
1.increase the ionization of the compound
2.decrease the melting point of the compound
3.increase the reactivity of the compound
4.convert the covert the covalent compound into a mixture of ionic compounds.
In paper chromatography
1.the mobile phase is a liquid and the stationary phase is a solid
2.the mobile phase is a solid and the stationary phase is a liquid
3.both phases are liquids
4.both phases are solids.
In paper chromatography
1.the mobile phase is a liquid and the stationary phase is a solid
2.the mobile phase is a solid and the stationary phase is a liquid
3.both phases are liquids
4.both phases are solids.
In steam distillation the sum of the vapour pressure of the volatile compound and that of water is
1.equal to atmospheric pressure
2.less than atmospheric pressure
3.more than atmospheric pressure
4.exactly half of the atmospheric pressure.
Naphthalene can be purified by
1.Sublimation
2.Crystallization
3.Extraction with a solvent
4.Distillation.
Naphthalene can be purified by
1.Sublimation
2.Crystallization
3.Extraction with a solvent
4.Distillation.
Refining of petroleum involves the process ofFractional distillation
1.Simple distillation
2.Fractional distillation
3.Steam distillation
4.Distillation under reduced pressure.
Separation of two substances by fractional crystallisation depends upon their difference inBoiling points.
1.Densities
2.Solubilities
3.Melting point
4.Boiling points.
Separation of two substances by fractional crystallisation depends upon their difference inMelting point
1.Densities
2.Solubilities
3.Melting point
4.Boiling points.
Steam distillation is used for the extraction of
1.Essential oils
2.Higher alkynes
3.Mineral oils
4.Fatty acids.
Sublimation cannot be used for purification of
1.Naphthalene
2.Camphor
3.Benzoic acid
4.Urea.
Sugar containing an impurity of common salt can be purified by crystallization from
1.Benzene
2.Ethanol
3.Petroleum ether
4.Water.
Sugar containing an impurity of common salt can be purified by crystallization from
1.Benzene
2.Ethanol
3.Petroleum ether
4.Water.
The Beilsteins test is a rapid test used for organic compounds to detect
1.Phosphorus
2.Sulphur
3.Halogens
4.Nitrogen.
The Beilsteins test is a rapid test used for organic compounds to detectSulphur
1.Phosphorus
2.Sulphur
3.Halogens
4.Nitrogen.
The boiling point of a compound does not depend upon
1.Solubility of the compound in water
2.Hydrogen bonding
3.Size of molecules
4.Polarity of the molecule.
The chloroplatinate of an organic base contains 39% of Pt. The equivalent mass of the base is
1.73
2.59
3.65
4.45
The formation of violet colour when sodium nitroprusside is added to sodium extract indicates the presence of
1.Nitrogen
2.Sulphur
3.Oxygen
4.Halogens.
The formation of violet colour when sodium nitroprusside is added to sodium extract indicates the presence of.
1.Nitrogen
2.Sulphur
3.Oxygen
4.Halogens
The purification of benzeneamine is done by
1.Steam distillation
2.Chromatographic techniques
3.Fractional crystallisation
4.By adding oxalic acid.
The separation an organic compound from it s aqueous solution can be achieved by:Steam distillation
1.Distillation
2.Steam distillation
3.Solvent extraction
4.Fractional distillation.
The separation of the constituents of a mixture by column chromatography depends upon their
1.Different solubilities
2.Different boiling points
3.Different refractive indices
4.Differential adsorption.
The technique of gas chromatography is suitable for compounds which
1.are liquids
2.have very low boiling points
3.are soluble in water
4.vapourize without decomposition.
When a solid vapourize directly without melting the process is called
1.Evaporation
2.Sedimentation
3.Saponification
4.Sublimation.
When a solid vapourize directly without melting the process is calledEvaporation
1.Evaporation
2.Sedimentation
3.Saponification
4.Sublimation.
Which of the following element s in an organic compound cannot be detected by Lassaignes test?
1.N
2.S
3.Cl
4.H.