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