1 - Boron in soil has been considered micronutrient for
Proper growth of plants
2 - One of the outstanding features of boron is its ability to form
Molecular addition compounds
3 - Substance which is found in dried up lakes of Tibet and California is
Tincal
4 - Borax is a white crystalline solid and it is
More soluble in hot water
5 - Which of the following does not give Borax bead test?
A1
6 - Special features of borate glass is that it is
Heat resistant
7 - The metal which is used in thermite process because of its activity is
aluminium
8 - Aluminium oxide is
Amphoteric oxide
9 - Which of the following shows inert pair effect?
tin
10 - Boron is non metal while other elements of IIIA group are metals. This is because
all of the above
11 - CO2 is gas while SiO2 is solid at room temperature.
CO2 is an independent molecule while SiO2 has network covalent structure
12 - The coloured glassy mass in borax bead test is due to the formation of
metal meta borate
13 - Identify the correct statement regarding CO
it reacts with red blood cells of haemoglobin
14 - If temperature of gallium arsenide is increased then its conductivity will
increase
15 - Boric acid cannot be used
In soda bottles
16 - Which of the following will decompose to produce litharge
Pb3O4
17 - Which element can form tripositive ion?
Aluminium
18 - Which of the following is metasilicic acid?
H2SiO3
19 - Which electronic configuration corresponds to an element of group IIIA?
1s2 2s2 2p6 3s2 3p1
20 - Tincal is a mineral of
"B"
21 - In network of silica (SiO2) each silicon atom is surrounded by _________ atoms of osygen
4
22 - Which one of the following is not a semiconductor?
Sn
23 - Orthoboric acid is 2.6% soluble in water at 40Degree Centigrade and ________at 107Degree Centigrade.
0.37
24 - The process of aluminium extraction is called
Hall process
25 - Because of its ability to combine with both oxygen and nitrogen aluminium metal is used
To remove air bubbles from molten metal
26 - Aqueous solution of borax above 62Degree Centigrade gives crystals of
Na2B4O7.5H2O
27 - Which of the following is not a use of silicon?
Antifreeze
28 - Which of the following is different with respect to physical appearance?
Phosphorus
29 - Which one of the followings possesses melting point below 0Degree Centigrade?
Nitrogen
30 - Compounds of nitrogen and phosphorus are mostly
covalent
31 - The most electronegative element among the following is
N
32 - SO3 is not absorbed in water directly because
Reaction is exothermic
33 - Phosphene gas will be produced if phosphorous acid is subjected to
Both b & c
34 - Which of the following will give phosphoric acid one reaction with water
All of the above
35 - Which one of following is not a property of pure quartz?
Coloured solid
36 - Phosphorus is a Greek word and it means
Light bearing
37 - Which of the following does not contain phosphorus?
Steel
38 - Allotropic form of phosphorus that is poisonous is
White
39 - Which one of the following is not the use of graphite?
Abrasive
40 - Acetic anhydride can be obtained by treating ethyl alcohol with
Both a and b
41 - The composition of brown ring in nitrate test is
FeSO4.No
42 - Phosphorous acid upon thermal decomposition yields phosphoric acid and
Phosphine
43 - Which one of the following compounds usually smells like garlic?
P2O3
44 - P2O5 is a hygroscopic powder which sublimes at
360Degree Centigrade
45 - The element of group VIA which is a non-metal is
S
46 - Phosphoric acid is a weak acid and its basicity is
3
47 - All the elements in group VIA are _______ in nature.
polymeric
48 - Which allotropic form of phosphorous is the most stable?
black
49 - The gas which cannot be dried by conc. H2SO4
H2S
50 - The chemical composition of cinnabar is
HgS
51 - FeSO4 forms brown ring with
NO
52 - Oxygen and sulphur resemble in all except
Show same oxidation state
53 - Oxygen does not react with all except
Metals
54 - Arsenic oxides are removed by passing through
Ferric hydroxide
55 - In which compound nitrogen has maximum oxidation state
HNO3
56 - When sulphuric acid is treated with ethanol sulphuric acid behaves like
a dehydrating agent
57 - Among the halogens the rare element is
Astatine
Pages
No comments:
Post a Comment
Your Valued Comments Help us to improve our site. Thanks