Welcome to your P & C of OC - 4
1.
Lassaigne’s extract is
3.
Carbon detection test fails if
4.
Which reaction forms NaCN in fusion?
5.
Limewater turns milky due to formation of
6.
Nitrogen detection gives Prussian blue colour due to formation of
7.
Which element cannot be detected directly in organic compounds?
8.
Fresh FeSO4 is compulsory in nitrogen test because old FeSO4
9.
Phenol is separated from acids using
10.
Purpose of fusing organic compound with sodium in Lassaigne’s test is to convert elements into
11.
Hoffmann’s method separates amines using
12.
Deep blue colour in nitrogen test confirms formation of
13.
Potassium is not used in Lassaigne’s test because it
14.
Which compound gives positive test for both N and S?
15.
Gas-liquid chromatography mobile phase is
16.
Halogen test is done after boiling sodium extract with
17.
Which compound gives false negative nitrogen test?
18.
Which compound interferes in nitrogen detection giving false result?
19.
Which reagent is used for carbon and hydrogen detection?
20.
When both nitrogen and sulphur are present, which compound is formed?
21.
Which precipitate dissolves in NH3?
22.
Which compound does NOT give positive Lassaigne test for nitrogen?
23.
Which halogen gives yellow precipitate with AgNO3?
24.
CO2 evolution confirms presence of
25.
Carbon detection is based on formation of
26.
Hinsberg reagent is used to separate
27.
Sulphur is detected by sodium nitroprusside test due to formation of
28.
Detection of elements is called
29.
Why halogen test is done after acidifying extract?
30.
Prussian blue colour disappears if
31.
Chromatography separates substances based on
32.
Why lithium is not used in Lassaigne’s test?
33.
Benzene is separated from thiophene using
34.
Absolute alcohol is separated using
35.
Thiophene dissolves in conc. H2SO4 due to
36.
Order of solubility of AgX in NH3 is
37.
Which halogen is not detected by Lassaigne’s test?
38.
Sulphur is converted into which ionic species in Lassaigne’s test?
39.
Lead acetate test for sulphur gives
40.
Sodium extract must be
41.
Halogens are detected using
42.
Chromatography is useful when substance is present in
43.
Hydrogen detection is confirmed by
44.
Nitrogen in organic compound is converted into which compound during sodium fusion?
45.
Halogens are detected in Lassaigne’s test in the form of
