Welcome to your P & C of OC
1.
Which element forms Na2S in Lassaigne’s test?
2.
Kjeldahl’s method cannot estimate nitrogen in
3.
Chromatography is ineffective if compounds have
4.
Lassaigne’s test converts nitrogen into
5.
Sulphur and nitrogen together give which Lassaigne extract result?
6.
Beilstein test detects presence of
7.
Which element cannot be detected by Lassaigne’s test?
8.
Paper chromatography stationary phase is
9.
Which test confirms sulphur in organic compound?
10.
Which technique separates dyes from ink?
11.
Rf value maximum possible is
12.
Which solvent is polar?
13.
Sublimation is preferred for purification when the compound
14.
Which test detects chlorine?
15.
Fractional distillation differs from simple distillation due to presence of
16.
Adsorption chromatography uses stationary phase as
17.
Which solvent is unsuitable for crystallization?
18.
Steam distillation is used for compounds which are
19.
Addition of charcoal during crystallization removes
20.
Steam distillation reduces boiling point because
21.
Which impurity is removed by washing crystals with cold solvent?
22.
Fractional crystallization is best applied when two solids differ mainly in
23.
Chromatography separates components mainly based on
24.
Which pair is separated by steam distillation?
25.
Petroleum ether is mainly used as
26.
Which compound decomposes on heating hence needs vacuum distillation?
27.
Which method purifies iodine?
28.
Dumas method estimates nitrogen by measuring
29.
Which is NOT a stationary phase?
30.
Which compound is purified by sublimation?
31.
Distillation works on difference in
32.
Which solvent is ideal for recrystallization?
33.
Which mixture requires fractional distillation?
34.
Which impurity cannot be removed by crystallization?
35.
Which compound cannot be purified by steam distillation?
36.
Which impurity remains in mother liquor during crystallization?
37.
Fractional crystallization requires
38.
Which pair is best separated by simple distillation?
40.
Which halogen does NOT respond to Beilstein test?
41.
Vacuum distillation is preferred when the compound
42.
Which impurity is removed by filtration?
43.
Which method separates volatile liquid from non-volatile impurity?
44.
Best method to separate kerosene and diesel
45.
Fractionating column increases
