Welcome to your P & C of OC
1.
Which compound cannot be purified by steam distillation?
2.
Sublimation is preferred for purification when the compound
3.
Vacuum distillation is preferred when the compound
4.
Which element forms Na2S in Lassaigne’s test?
5.
Fractional distillation differs from simple distillation due to presence of
6.
Which is NOT a stationary phase?
7.
Which method separates volatile liquid from non-volatile impurity?
8.
Chromatography is ineffective if compounds have
9.
Chromatography separates components mainly based on
10.
Fractionating column increases
11.
Which impurity is removed by filtration?
12.
Beilstein test detects presence of
13.
Fractional crystallization is best applied when two solids differ mainly in
14.
Petroleum ether is mainly used as
15.
Which pair is best separated by simple distillation?
16.
Which compound decomposes on heating hence needs vacuum distillation?
17.
Lassaigne’s test converts nitrogen into
18.
Which solvent is unsuitable for crystallization?
19.
Which test detects chlorine?
20.
Best method to separate kerosene and diesel
21.
Fractional crystallization requires
22.
Sulphur and nitrogen together give which Lassaigne extract result?
23.
Which method purifies iodine?
24.
Rf value maximum possible is
25.
Which impurity remains in mother liquor during crystallization?
26.
Which impurity cannot be removed by crystallization?
27.
Which element cannot be detected by Lassaigne’s test?
28.
Which solvent is ideal for recrystallization?
29.
Which technique separates dyes from ink?
30.
Which halogen does NOT respond to Beilstein test?
31.
Which compound is purified by sublimation?
32.
Dumas method estimates nitrogen by measuring
34.
Which solvent is polar?
35.
Which test confirms sulphur in organic compound?
36.
Addition of charcoal during crystallization removes
37.
Steam distillation reduces boiling point because
38.
Distillation works on difference in
39.
Which mixture requires fractional distillation?
40.
Steam distillation is used for compounds which are
41.
Which pair is separated by steam distillation?
42.
Adsorption chromatography uses stationary phase as
43.
Which impurity is removed by washing crystals with cold solvent?
44.
Kjeldahl’s method cannot estimate nitrogen in
45.
Paper chromatography stationary phase is
