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