Welcome to your P & C of OC - 4
1.
Limewater turns milky due to formation of
2.
Deep blue colour in nitrogen test confirms formation of
3.
Purpose of fusing organic compound with sodium in Lassaigne’s test is to convert elements into
4.
Which compound does NOT give positive Lassaigne test for nitrogen?
5.
Nitrogen detection gives Prussian blue colour due to formation of
6.
Detection of elements is called
7.
Why halogen test is done after acidifying extract?
8.
Which element cannot be detected directly in organic compounds?
9.
Benzene is separated from thiophene using
10.
Which reaction forms NaCN in fusion?
11.
Chromatography separates substances based on
12.
Which halogen gives yellow precipitate with AgNO3?
13.
Fresh FeSO4 is compulsory in nitrogen test because old FeSO4
14.
Hinsberg reagent is used to separate
15.
Nitrogen in organic compound is converted into which compound during sodium fusion?
16.
Halogen test is done after boiling sodium extract with
17.
Which compound interferes in nitrogen detection giving false result?
18.
Sodium extract must be
19.
Hoffmann’s method separates amines using
20.
Carbon detection is based on formation of
21.
Carbon detection test fails if
22.
Which compound gives positive test for both N and S?
23.
Which precipitate dissolves in NH3?
24.
Which reagent is used for carbon and hydrogen detection?
25.
CO2 evolution confirms presence of
26.
Thiophene dissolves in conc. H2SO4 due to
27.
Which compound gives false negative nitrogen test?
28.
Order of solubility of AgX in NH3 is
29.
Halogens are detected in Lassaigne’s test in the form of
30.
Sulphur is converted into which ionic species in Lassaigne’s test?
31.
Lead acetate test for sulphur gives
32.
Halogens are detected using
33.
Sulphur is detected by sodium nitroprusside test due to formation of
34.
Potassium is not used in Lassaigne’s test because it
35.
Chromatography is useful when substance is present in
37.
Phenol is separated from acids using
38.
Prussian blue colour disappears if
39.
Which halogen is not detected by Lassaigne’s test?
40.
Why lithium is not used in Lassaigne’s test?
41.
When both nitrogen and sulphur are present, which compound is formed?
42.
Gas-liquid chromatography mobile phase is
43.
Lassaigne’s extract is
44.
Hydrogen detection is confirmed by
45.
Absolute alcohol is separated using
