Welcome to your P & C of OC -3
1.
TLC plate is visualized using
2.
Glycerol is purified by vacuum distillation because
4.
Thin layer chromatography stationary phase is usually
5.
Fractional distillation is preferred over simple distillation when boiling point difference is
7.
Vacuum distillation lowers BP by
8.
Which pair is best separated by fractional distillation?
9.
Two compounds having same Rf value indicate
10.
Strongly adsorbed component moves
11.
Azeotropic mixture distils
12.
Increasing solvent polarity in chromatography causes Rf to
13.
Chromatography fails if components have
14.
To break ethanol–water azeotrope, the added liquid must have
15.
Fractional distillation of crude oil gives
16.
Chromatography was introduced by
17.
Rf value is independent of
18.
Steam distillation prevents decomposition because
19.
Steam distillation is suitable for compounds that are
20.
Fractional distillation involves
21.
Which compound cannot be purified by steam distillation?
22.
Which method is best to separate mixture of dyes?
23.
Which mixture cannot be separated by fractional distillation?
24.
Which is NOT a mobile phase?
25.
Vacuum distillation is also known as
26.
Ortho-nitrophenol is steam distilled more easily than para-nitrophenol because
27.
More volatile liquid distils
28.
In chromatography, separation is based on difference in
29.
Which adsorbent is commonly used in chromatography?
30.
Function of fractionating column is to increase
31.
Paper chromatography is an example of
32.
TLC is mainly used for purification
33.
Steam distillation is based on the principle that total vapour pressure is
34.
In adsorption chromatography, stationary phase is
35.
Partition chromatography involves
36.
TLC is superior to paper chromatography because
37.
Strong adsorption leads to
38.
In paper chromatography, stationary phase is
39.
In steam distillation, mixture boils when
40.
Paper chromatography is used to separate
41.
Chromatography is especially useful when substance is
42.
Steam distillation is ineffective if compound is
43.
Mobile phase in column chromatography is
44.
Vacuum distillation is used when a compound
45.
Best method to identify unknown organic compound among many
