The 'Organic Lab \ud83d\udc9a' quiz assesses understanding of fundamental lab techniques in organic chemistry, focusing on melting points and purity testing. It evaluates knowledge on how impurities affect melting points and the importance of these properties in identifying substance purity.
The transformation of solid to liquid is called melting and the reverse process is called freezing
The transformation of solid to liquid is called freezing and the reverse process is called melting
The transformation of liquid to solid is called melting and the reverse process is called freezing
None of the mentioned
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Know the functional group present in a compound
Know the purity of a compound
Know the mass of the substance
Know the volume of the substance
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H2O
Organic solvent
Alumina, or silica gel
He or H2
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True
FalseÂ
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True
False
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True
False
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True
False
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To remove excess of acidic compound in organic solution
Remove excess of H2O
To remove trace of basic compound in organic solution.
Change the distribution coefficient between organic solvent and aqueous solvent,
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Difference in the method of determination of melting point
Difference in the bond length between atoms
Difference in the surface area of the substances.
Intermolecular forces of different strength.
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True
False
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The temperature at which its vapor pressure equals atmosphere pressure.
is the temperature at which the first crystal just starts to melt
A+c
None of the above
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True
False
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Scratching the inside surface of the flask by glass rod
Seeding crystal
Ice water bath
All the above
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True
False
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True
Fase
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Mobile phase
Stationary
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True
False
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Mobile phase
Stationary
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Decreases
Increases sharply
Slightly increases
No change
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Immiscible with the first solvent
The extraction solvent should be sufficiently volatile
To solvent should have a density different from that of water to from two distinguishable layers
Dissolve the compound to be extracted and don’t react
All the above
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Iodine chamber
Vanillin
KMnO4
All the above
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Its melting point and boiling point
Chromatographic technique
Spectroscopy
All of the mentioned
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True
False
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Small crystal
Moderate crystal
Large crystal
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To remove the tannins compound .
Remove excess of H2O
To remove trace of basic compound in organic solution.
Change the distribution coefficient between organic solvent and aqueous solvent,
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Used specially to purify liquids that are not Very Volatile and are Immiscible with Water
When the boiling point of the compound(or the solvent)is too high
Used effectively to separate liquids that less than 70 degrees difference in their boiling points
Used effectively to separate liquids that have at least 70 degrees difference in their boiling points
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Remove excess of H2O
To remove excess of acidic compound in organic solution
To remove trace of basic compound in organic solution.
Anti foaming agent
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True
False
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True
False
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False
True
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It increase the amount of evaporated solvent because its sloping side will act as a condense
Bumping
Covered
B+c
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Volatile, liquid
Non-volatile, liquid
Non-volatile, solid
Volatile, solid
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The Stationary phas
The Mobile Phase:
Spotting the Plate
A+c
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Dilute solution
Saturated solution
Slow cooling
Bubbles
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True
False
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Short
Tall
A+c
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