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Purification Of Organic Compounds
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Purification Of Organic Compounds
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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 acidsolution.
The molar mass of the acid is
The molecular mass of an organic compound which contains only one nitrogen atom can be
Separation of two substances by fractional crystallisation depends upon their difference in
In paper chromatography,
both phases are liquids
the mobile phase is a solid and the stationary phase is a liquid
both phases are solids.
the mobile phase is a liquid and the stationary phase is a solid
The purification of benzeneamine is done by
By adding oxalic acid.
The separation an organic compound from it s aqueous solution can be achieved by
Chromatographic technique was introduced by
Haemoglobin contains 0.33% of iron bymass.
The molecular mass of haemoglobin is approximately67200.
The number of iron atoms [at. mass Fe = 56] present is one molecule of haemoglobin is
0.59 g of the silver salt of an organic acid (mol.
Mass 210) on ignition gave 0.36 of puresilver.
The basicity of the acid is
When a solid vapourize directly without melting, the process is called
The technique of gas chromatography is suitable for compounds which
have very low boiling points
vapourize without decomposition.
are soluble in water
The Beilsteins test is a rapid test used for organic compounds to detect
An organic compound having carbon, hydrogen and sulphur contains 4% ofsulphur.
The minimum molecular mass of the compound is
Which of the following element s in an organic compound cannot be detected by Lassaignes test
The boiling point of a compound does not depend upon
Polarity of the molecule.
Solubility of the compound in water
Size of molecules
Naphthalene can be purified by
Extraction with a solvent
By decreasing the pressure, the boiling point of a liquid
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
Refining of petroleum involves the process of
Distillation under reduced pressure.
The separation of the constituents of a mixture by column chromatography depends upon their
Different refractive indices
Different boiling points
0.532 g of the chloroplatinate of an organic base (mol.
Mass 264) gave 0.195 g Pt onignition.
Then the number of nitrogen atoms per molecule of the base is
A mixture of camphor and benzoic acid can be separated by which of the following technique
Extraction with a solvent.
The chloroplatinate of an organic base contains 39% of Pt. The equivalent mass of the base is
Sublimation cannot be used for purification of
A compound which does not give a positive test in the Lassaignes test for nitrogen is
A mixture of acetone and methanol can be separated by
In steam distillation, the sum of the vapour pressure of the volatile compound and that of water is
less than atmospheric pressure
exactly half of the atmospheric pressure.
more than atmospheric pressure
equal to atmospheric pressure
The formation of violet colour when sodium nitroprusside is added to sodium extract indicates the presence of
In Lassaignes test, the organic compound is fused with a piece of sodium metal in order to
increase the ionization of the compound
decrease the melting point of the compound
convert the covert the covalent compound into a mixture of ionic compounds.
increase the reactivity of the compound
Sugar containing an impurity of common salt can be purified by crystallization from