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.
Posted Date:-2021-10-07 18:09:22
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
Posted Date:-2021-10-07 18:09:22
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
Posted Date:-2021-10-07 18:09:22
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.
Posted Date:-2021-10-07 18:09:22
A mixture of acetone and methanol can be separated by
1.Vacuum distillation
2.Steam distillation
3.Fractional distillation
4.Simple distillation.
Posted Date:-2021-10-07 18:09:22
A mixture of benzoic acid and naphthalene can be separated by crystallization from
1.Hot water
2.Cold water
3.Benzene
4.Ether.
Posted Date:-2021-10-07 18:09:22
A mixture of benzoic acid and naphthalene can be separated by crystallization from
1.Hot water
2.Cold water
3.Benzene
4.Ether.
Posted Date:-2021-10-07 18:09:22
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.
Posted Date:-2021-10-07 18:09:22
A mixture of o-hydroxyacetophenone and hydroxyacetophenone can be separated by
1.Sublimation
2.Steam distillation
3.Fractional crystallization
4.Distillation.
Posted Date:-2021-10-07 18:09:22
A mixture of o-hydroxyacetophenone and hydroxyacetophenone can be separated by.
1.Sublimation
2.Steam distillation
3.Fractional crystallization
4.Distillation
Posted Date:-2021-10-07 18:09:22
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.
Posted Date:-2021-10-07 18:09:22
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
Posted Date:-2021-10-07 18:09:22
By decreasing the pressure the boiling point of a liquid
1.Increases
2.Decreases
3.Remains constant
4.May increases or decrease.
Posted Date:-2021-10-07 18:09:22
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
Posted Date:-2021-10-07 18:09:22
Chromatographic technique was introduced by
1.Duma (1803)
2.Kjeldhl (1903)
3.Tswett (1906)
4.Lavosier.
Posted Date:-2021-10-07 18:09:22
Chromatographic technique was introduced by
1.Duma (1803)
2.Kjeldhl (1903)
3.Tswett (1906)
4.Lavosier.
Posted Date:-2021-10-07 18:09:22
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
Posted Date:-2021-10-07 18:09:22
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.
Posted Date:-2021-10-07 18:09:22
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.
Posted Date:-2021-10-07 18:09:22
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.
Posted Date:-2021-10-07 18:09:22
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.
Posted Date:-2021-10-07 18:09:22
Naphthalene can be purified by
1.Sublimation
2.Crystallization
3.Extraction with a solvent
4.Distillation.
Posted Date:-2021-10-07 18:09:22
Naphthalene can be purified by
1.Sublimation
2.Crystallization
3.Extraction with a solvent
4.Distillation.
Posted Date:-2021-10-07 18:09:22
Refining of petroleum involves the process ofFractional distillation
1.Simple distillation
2.Fractional distillation
3.Steam distillation
4.Distillation under reduced pressure.
Posted Date:-2021-10-07 18:09:22
Separation of two substances by fractional crystallisation depends upon their difference inBoiling points.
1.Densities
2.Solubilities
3.Melting point
4.Boiling points.
Posted Date:-2021-10-07 18:09:22
Separation of two substances by fractional crystallisation depends upon their difference inMelting point
1.Densities
2.Solubilities
3.Melting point
4.Boiling points.
Posted Date:-2021-10-07 18:09:22
Steam distillation is used for the extraction of
1.Essential oils
2.Higher alkynes
3.Mineral oils
4.Fatty acids.
Posted Date:-2021-10-07 18:09:22
Sublimation cannot be used for purification of
1.Naphthalene
2.Camphor
3.Benzoic acid
4.Urea.
Posted Date:-2021-10-07 18:09:22
Sugar containing an impurity of common salt can be purified by crystallization from
1.Benzene
2.Ethanol
3.Petroleum ether
4.Water.
Posted Date:-2021-10-07 18:09:22
Sugar containing an impurity of common salt can be purified by crystallization from
1.Benzene
2.Ethanol
3.Petroleum ether
4.Water.
Posted Date:-2021-10-07 18:09:22
The Beilsteins test is a rapid test used for organic compounds to detect
1.Phosphorus
2.Sulphur
3.Halogens
4.Nitrogen.
Posted Date:-2021-10-07 18:09:22
The Beilsteins test is a rapid test used for organic compounds to detectSulphur
1.Phosphorus
2.Sulphur
3.Halogens
4.Nitrogen.
Posted Date:-2021-10-07 18:09:22
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.
Posted Date:-2021-10-07 18:09:22
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
Posted Date:-2021-10-07 18:09:22
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.
Posted Date:-2021-10-07 18:09:22
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
Posted Date:-2021-10-07 18:09:22
The purification of benzeneamine is done by
1.Steam distillation
2.Chromatographic techniques
3.Fractional crystallisation
4.By adding oxalic acid.
Posted Date:-2021-10-07 18:09:22
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.
Posted Date:-2021-10-07 18:09:22
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.
Posted Date:-2021-10-07 18:09:22
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.
Posted Date:-2021-10-07 18:09:22
When a solid vapourize directly without melting the process is called
1.Evaporation
2.Sedimentation
3.Saponification
4.Sublimation.
Posted Date:-2021-10-07 18:09:22
When a solid vapourize directly without melting the process is calledEvaporation
1.Evaporation
2.Sedimentation
3.Saponification
4.Sublimation.
Posted Date:-2021-10-07 18:09:22
Which of the following element s in an organic compound cannot be detected by Lassaignes test?
1.N
2.S
3.Cl
4.H.
Posted Date:-2021-10-07 18:09:22