Welcome to your P & C of OC - 5
1.
Which test uses ammonium molybdate?
2.
Why sodium extract is neutralised before halogen test?
3.
In halogen test, sodium extract is boiled with HNO3 to remove
4.
Orange colour in CCl4 layer indicates
5.
Red colour in Middleton’s test confirms presence of
6.
Beilstein’s test confirms presence of
7.
Dark yellow precipitate insoluble in NH4OH confirms
8.
Which precipitate colour confirms iodine?
9.
Middleton’s test detects sulphur by formation of
10.
Test for sulphur fails if compound contains
11.
In Lassaigne’s test, sulphur is detected using lead acetate due to formation of
12.
White precipitate with AgNO3 indicates presence of
13.
Phosphorus test involves oxidation state change from
14.
Sodium peroxide is used in phosphorus test because it
15.
CCl4 layer test is mainly used for detection of
16.
Which test is confirmatory for sulphur?
17.
Black precipitate with lead acetate indicates
18.
Chlorine water is added in CCl4 test to
19.
Violet colour with sodium nitroprusside indicates presence of
20.
Ammonium phosphomolybdate precipitate colour is
21.
Sodium thiocyanate reacts with FeCl3 to give
22.
In halogen test, NaX reacts with AgNO3 to form
23.
Which reagent removes Na2S before halogen test?
24.
CCl4 is preferred because it is
25.
Ammonium molybdate is added to confirm presence of
26.
AgCl dissolves in NH4OH due to formation of
27.
False positive Beilstein test is given by
28.
Beilstein’s test fails for fluorine because
29.
Blackening of silver coin dipped in sodium extract indicates
30.
Which halogen gives maximum solubility in NH4OH?
31.
Light yellow precipitate partially soluble in NH4OH confirms
32.
Violet colour in CCl4 layer confirms
33.
Green flame in Beilstein’s test may also be due to presence of
34.
Test for phosphorus involves conversion into
35.
Reagent used in phosphorus detection after fusion is
36.
AgI does not dissolve in NH4OH because
37.
Detection of sulphur, nitrogen, halogens comes under
38.
Silver coin test turning black indicates formation of
39.
Yellow precipitate in phosphorus test is due to formation of
40.
Bluish green flame in Beilstein’s test indicates
41.
Which test confirms halogen by flame colour?
42.
Which halide gives curdy precipitate?
43.
Which halogen is not detected by AgNO3 test?
44.
Sulphur present as sulphate gives
45.
Which ion interferes in halogen test if not removed?
