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