Welcome to your P & C of OC
1.
Which compound is purified by sublimation?
2.
Kjeldahl’s method cannot estimate nitrogen in
3.
Which method purifies iodine?
4.
Steam distillation is used for compounds which are
5.
Distillation works on difference in
6.
Which pair is separated by steam distillation?
7.
Which is NOT a stationary phase?
8.
Fractional crystallization requires
9.
Sulphur and nitrogen together give which Lassaigne extract result?
10.
Which impurity cannot be removed by crystallization?
11.
Fractional crystallization is best applied when two solids differ mainly in
12.
Dumas method estimates nitrogen by measuring
13.
Which element cannot be detected by Lassaigne’s test?
14.
Vacuum distillation is preferred when the compound
15.
Which compound cannot be purified by steam distillation?
17.
Adsorption chromatography uses stationary phase as
18.
Which solvent is ideal for recrystallization?
19.
Which impurity remains in mother liquor during crystallization?
20.
Fractional distillation differs from simple distillation due to presence of
21.
Fractionating column increases
22.
Petroleum ether is mainly used as
23.
Which test confirms sulphur in organic compound?
24.
Which solvent is unsuitable for crystallization?
25.
Beilstein test detects presence of
26.
Sublimation is preferred for purification when the compound
27.
Which test detects chlorine?
28.
Which method separates volatile liquid from non-volatile impurity?
29.
Which technique separates dyes from ink?
30.
Which solvent is polar?
31.
Paper chromatography stationary phase is
32.
Rf value maximum possible is
33.
Addition of charcoal during crystallization removes
34.
Which pair is best separated by simple distillation?
35.
Which impurity is removed by washing crystals with cold solvent?
36.
Lassaigne’s test converts nitrogen into
37.
Which impurity is removed by filtration?
38.
Which halogen does NOT respond to Beilstein test?
39.
Chromatography is ineffective if compounds have
40.
Which mixture requires fractional distillation?
41.
Steam distillation reduces boiling point because
42.
Which compound decomposes on heating hence needs vacuum distillation?
43.
Chromatography separates components mainly based on
44.
Which element forms Na2S in Lassaigne’s test?
45.
Best method to separate kerosene and diesel
