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Purification Of Organic Compounds
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Purification Of Organic Compounds
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The separation an organic compound from it s aqueous solution can be achieved by
The formation of violet colour when sodium nitroprusside is added to sodium extract indicates the presence of
Separation of two substances by fractional crystallisation depends upon their difference in
When a solid vapourize directly without melting, the process is called
Sugar containing an impurity of common salt can be purified by crystallization from
In Lassaignes test, the organic compound is fused with a piece of sodium metal in order to
increase the reactivity of the compound
increase the ionization of the compound
convert the covert the covalent compound into a mixture of ionic compounds.
decrease the melting point of the compound
The boiling point of a compound does not depend upon
Size of molecules
Solubility of the compound in water
Polarity of the molecule.
Steam distillation is used for the extraction of
A compound which does not give a positive test in the Lassaignes test for nitrogen is
Sublimation cannot be used for purification of
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
Naphthalene can be purified by
Extraction with a solvent
Certain organic compound contains 10% of sulphur is it. Which of the following represent the minimum molecular mass of the compound
The separation of the constituents of a mixture by column chromatography depends upon their
Different boiling points
Different refractive indices
In steam distillation, the sum of the vapour pressure of the volatile compound and that of water is
more than atmospheric pressure
exactly half of the atmospheric pressure.
equal to atmospheric pressure
less than atmospheric pressure
Refining of petroleum involves the process of
Distillation under reduced pressure.
Which of the following element s in an organic compound cannot be detected by Lassaignes test
A mixture of camphor and benzoic acid can be separated by which of the following technique
Extraction with a solvent.
The purification of benzeneamine is done by
By adding oxalic acid.
The molecular mass of an organic compound which contains only one nitrogen atom can be
An organic compound having carbon, hydrogen and sulphur contains 4% ofsulphur.
The minimum molecular mass of the compound is
The Beilsteins test is a rapid test used for organic compounds to detect
Chromatographic technique was introduced by
A mixture of o-hydroxyacetophenone and hydroxyacetophenone can be separated by
By decreasing the pressure, the boiling point of a liquid
May increases or decrease.
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
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
A mixture of benzoic acid and naphthalene can be separated by crystallization from
The technique of gas chromatography is suitable for compounds which
are soluble in water
vapourize without decomposition.
have very low boiling points
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