Welcome to your P & C of OC
1.
Paper chromatography stationary phase is
2.
Chromatography is ineffective if compounds have
3.
Which method separates volatile liquid from non-volatile impurity?
4.
Which is NOT a stationary phase?
5.
Adsorption chromatography uses stationary phase as
6.
Which technique separates dyes from ink?
7.
Distillation works on difference in
8.
Which solvent is unsuitable for crystallization?
9.
Kjeldahl’s method cannot estimate nitrogen in
10.
Which solvent is polar?
11.
Fractional crystallization requires
12.
Which test confirms sulphur in organic compound?
13.
Which method purifies iodine?
14.
Which pair is separated by steam distillation?
15.
Steam distillation reduces boiling point because
16.
Which element cannot be detected by Lassaigne’s test?
17.
Which impurity is removed by filtration?
18.
Addition of charcoal during crystallization removes
20.
Dumas method estimates nitrogen by measuring
21.
Lassaigne’s test converts nitrogen into
22.
Fractional crystallization is best applied when two solids differ mainly in
23.
Sulphur and nitrogen together give which Lassaigne extract result?
24.
Steam distillation is used for compounds which are
25.
Fractional distillation differs from simple distillation due to presence of
26.
Which element forms Na2S in Lassaigne’s test?
27.
Which compound is purified by sublimation?
28.
Vacuum distillation is preferred when the compound
29.
Beilstein test detects presence of
30.
Which compound cannot be purified by steam distillation?
31.
Sublimation is preferred for purification when the compound
32.
Which test detects chlorine?
33.
Chromatography separates components mainly based on
34.
Which mixture requires fractional distillation?
35.
Which halogen does NOT respond to Beilstein test?
36.
Which impurity remains in mother liquor during crystallization?
37.
Which solvent is ideal for recrystallization?
38.
Petroleum ether is mainly used as
39.
Rf value maximum possible is
40.
Which impurity cannot be removed by crystallization?
41.
Fractionating column increases
42.
Which pair is best separated by simple distillation?
43.
Which compound decomposes on heating hence needs vacuum distillation?
44.
Which impurity is removed by washing crystals with cold solvent?
45.
Best method to separate kerosene and diesel
