Welcome to your P & C of OC
1.
Fractional crystallization requires
2.
Best method to separate kerosene and diesel
4.
Fractional crystallization is best applied when two solids differ mainly in
5.
Addition of charcoal during crystallization removes
6.
Which is NOT a stationary phase?
7.
Fractionating column increases
8.
Which element forms Na2S in Lassaigne’s test?
9.
Which solvent is polar?
10.
Vacuum distillation is preferred when the compound
11.
Chromatography is ineffective if compounds have
12.
Which element cannot be detected by Lassaigne’s test?
13.
Chromatography separates components mainly based on
14.
Which pair is separated by steam distillation?
15.
Which technique separates dyes from ink?
16.
Which impurity remains in mother liquor during crystallization?
17.
Sublimation is preferred for purification when the compound
18.
Which pair is best separated by simple distillation?
19.
Which impurity is removed by filtration?
20.
Steam distillation is used for compounds which are
21.
Which compound is purified by sublimation?
22.
Which impurity cannot be removed by crystallization?
23.
Which test detects chlorine?
24.
Paper chromatography stationary phase is
25.
Which method purifies iodine?
26.
Rf value maximum possible is
27.
Which solvent is ideal for recrystallization?
28.
Sulphur and nitrogen together give which Lassaigne extract result?
29.
Which method separates volatile liquid from non-volatile impurity?
30.
Kjeldahl’s method cannot estimate nitrogen in
31.
Steam distillation reduces boiling point because
32.
Dumas method estimates nitrogen by measuring
33.
Beilstein test detects presence of
34.
Adsorption chromatography uses stationary phase as
35.
Which impurity is removed by washing crystals with cold solvent?
36.
Petroleum ether is mainly used as
37.
Which compound decomposes on heating hence needs vacuum distillation?
38.
Which test confirms sulphur in organic compound?
39.
Lassaigne’s test converts nitrogen into
40.
Which solvent is unsuitable for crystallization?
41.
Distillation works on difference in
42.
Which halogen does NOT respond to Beilstein test?
43.
Which mixture requires fractional distillation?
44.
Which compound cannot be purified by steam distillation?
45.
Fractional distillation differs from simple distillation due to presence of
