Welcome to your P & C of OC - 4
1.
Carbon detection is based on formation of
2.
Which reaction forms NaCN in fusion?
3.
Why halogen test is done after acidifying extract?
4.
Deep blue colour in nitrogen test confirms formation of
5.
Which compound interferes in nitrogen detection giving false result?
6.
Sodium extract must be
7.
Which compound does NOT give positive Lassaigne test for nitrogen?
8.
Prussian blue colour disappears if
9.
Fresh FeSO4 is compulsory in nitrogen test because old FeSO4
10.
Potassium is not used in Lassaigne’s test because it
11.
Absolute alcohol is separated using
12.
Sulphur is converted into which ionic species in Lassaigne’s test?
13.
Chromatography is useful when substance is present in
14.
Halogen test is done after boiling sodium extract with
15.
Nitrogen detection gives Prussian blue colour due to formation of
16.
Why lithium is not used in Lassaigne’s test?
17.
Purpose of fusing organic compound with sodium in Lassaigne’s test is to convert elements into
18.
Lead acetate test for sulphur gives
19.
Detection of elements is called
20.
Sulphur is detected by sodium nitroprusside test due to formation of
21.
Which element cannot be detected directly in organic compounds?
22.
Chromatography separates substances based on
23.
Order of solubility of AgX in NH3 is
24.
Which reagent is used for carbon and hydrogen detection?
25.
Which precipitate dissolves in NH3?
26.
Hinsberg reagent is used to separate
27.
Which compound gives false negative nitrogen test?
28.
Gas-liquid chromatography mobile phase is
29.
Phenol is separated from acids using
30.
Hoffmann’s method separates amines using
31.
Halogens are detected in Lassaigne’s test in the form of
32.
Nitrogen in organic compound is converted into which compound during sodium fusion?
33.
Carbon detection test fails if
35.
Which compound gives positive test for both N and S?
36.
Benzene is separated from thiophene using
37.
CO2 evolution confirms presence of
38.
Halogens are detected using
39.
Lassaigne’s extract is
40.
When both nitrogen and sulphur are present, which compound is formed?
41.
Which halogen is not detected by Lassaigne’s test?
42.
Thiophene dissolves in conc. H2SO4 due to
43.
Hydrogen detection is confirmed by
44.
Which halogen gives yellow precipitate with AgNO3?
45.
Limewater turns milky due to formation of
