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