Welcome to your P & C of OC - 4
1.
Thiophene dissolves in conc. H2SO4 due to
2.
Carbon detection is based on formation of
3.
Which reaction forms NaCN in fusion?
4.
Phenol is separated from acids using
5.
Benzene is separated from thiophene using
6.
Purpose of fusing organic compound with sodium in Lassaigne’s test is to convert elements into
7.
Hinsberg reagent is used to separate
8.
Potassium is not used in Lassaigne’s test because it
10.
Which compound does NOT give positive Lassaigne test for nitrogen?
11.
Halogens are detected using
12.
Nitrogen in organic compound is converted into which compound during sodium fusion?
13.
Which reagent is used for carbon and hydrogen detection?
14.
Lead acetate test for sulphur gives
15.
Chromatography is useful when substance is present in
16.
Why lithium is not used in Lassaigne’s test?
17.
Sodium extract must be
18.
CO2 evolution confirms presence of
19.
Carbon detection test fails if
20.
Lassaigne’s extract is
21.
Sulphur is converted into which ionic species in Lassaigne’s test?
22.
Which precipitate dissolves in NH3?
23.
Halogens are detected in Lassaigne’s test in the form of
24.
Gas-liquid chromatography mobile phase is
25.
Prussian blue colour disappears if
26.
Absolute alcohol is separated using
27.
Which halogen gives yellow precipitate with AgNO3?
28.
Which halogen is not detected by Lassaigne’s test?
29.
Halogen test is done after boiling sodium extract with
30.
Which compound interferes in nitrogen detection giving false result?
31.
Fresh FeSO4 is compulsory in nitrogen test because old FeSO4
32.
Why halogen test is done after acidifying extract?
33.
Nitrogen detection gives Prussian blue colour due to formation of
34.
Hoffmann’s method separates amines using
35.
Which element cannot be detected directly in organic compounds?
36.
Which compound gives positive test for both N and S?
37.
Hydrogen detection is confirmed by
38.
Deep blue colour in nitrogen test confirms formation of
39.
Sulphur is detected by sodium nitroprusside test due to formation of
40.
Chromatography separates substances based on
41.
Limewater turns milky due to formation of
42.
When both nitrogen and sulphur are present, which compound is formed?
43.
Order of solubility of AgX in NH3 is
44.
Which compound gives false negative nitrogen test?
45.
Detection of elements is called
