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Published on: 28/11/2025
Download Tamil Nadu 12th Standard Chemistry question papers, model tests, one-mark questions, important questions, and public exam papers in PDF format. Free study materials and answer keys for TN State Board students.
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1.
Phyllo silicates are _______.
\(\left[\mathrm{Si}_{2} \mathrm{O}_{5}\right]_{\mathrm{n}}^{2 \mathrm{n}-}\)
\(\left[\mathrm{SiO}_{3}\right]_{\mathrm{n}}^{2 n-}\)
\(\left[\mathrm{Si}_{2} \mathrm{O}_{7}\right]^{6}\)
\(\left[\mathrm{SiO}_{4}\right]^{4-}\)
2.
______ are fibrous and non-combustible silicates
Asbestos
Amphiboles
Zeolites
Inosilicate
3.
Which one is phosgene?
COCl.5H2O
COCI3
COCI2
CaCI2
4.
The C = C bond length in Buckminster fullerene is _______.
1.38 Å
1.45 Å
1.54 Å
1.39 Å
5.
The hybridisation of carbon atoms in diamond is _______.
sp2
sp3
sp3d
dsp2
6.
Which one is used as styptic agent alum to arrest bleeding?
common salt
sugar
potash alum
coffee Potash
7.
Which one is a Sodium alum?
[Na2SO4.Al2(SO4)3.24H2O]
[K2SO4.Al2(SO4)3.5H2O]
[(NH4)2SO4.Al2(SO4)3.24H2O]
None
8.
It is the strongest oxidising agent and most reactive element among the halogens _______.
F
Cl
Br
I
9.
In group 15 to 18, the poor shielding effect of d & f electrons are overcome by the increased shielding effect of the additional ___________electron.
s
p
d
f
10.
Thermodynamically the most stable allotropic form of carbon is ________.
diamond
graphite
fullerenes
nano tubes
11.
Which of the following statement about H3BO3 is not correct?
It is a strong tribasic acid
It is prepared by acidifying an aqueous solution of borax
It is a layer structure in which planer BO3 units are joined by hydrogen borids
It does not act as proton donor but acts as a Lewis acid by accepting hydroxyl ions
12.
On hydrolysis BF3 gives Boric acid and converted to fluoroboric acid. The fluoroboric acid contains the species_______.
\( \mathrm{H}^{+}, \mathrm{F}^{-} \& \mathrm{BF}_{3} \)
\( \mathrm{H}^{+} \& \left[\mathrm{BF}_{4}\right]^{-} \)
\( \left[\mathrm{HBF}_{3}\right]^{+} \& \mathrm{~F}^{-} \)
\( \mathrm{H}^{+}, \mathrm{B}^{3+} \& \mathrm{~F}^{-} \)
13.
The stability of +1 oxidation state increases in the sequence ________.
Al < Ga < In < Tl
Tl < In < Ga < Al
In < Tl < Ga < Al
Ga< In < Al < Tl
14.
The compound that is used in nuclear reactors as protective shields and control rods is _________.
Metal borides
metal oxides
Metal carbonates
metal carbide
15.
Duralumin is an alloy of ______.
Cu, Mn
Cu, Al, Mg
Al, Mn
Al, Cu, Mn, Mg
16.
| Column-I | Column-II | ||
| A | Borazole | 1 | B(OH)3 |
| B | Boric acid | 2 | B3N3H6 |
| C | Quartz | 3 | Na2[B4O5(OH)4]8H2O |
| D | Borax | 4 | SiO2 |
| A | B | C | D |
| 2 | 1 | 4 | 3 |
| A | B | C | D |
| 1 | 2 | 4 | 3 |
| A | B | C | D |
| 1 | 2 | 4 | 3 |
None of these
17.
Which of the following statements is not correct?
Beryl is a cyclic silicate
Mg2SiO4 is an orthosilicate
SiO44−is the basic structural unit of silicates
Feldspar is not aluminosilicate
18.
The geometry at which carbon atom in diamond are bonded to each other is _______.
Tetrahedral
hexagonal
Octahedral
none of these
19.
Which of the following is not sp2 hybridised?
Graphite
graphene
Fullerene
dry ice
20.
Which of these is not a monomer for a high molecular mass silicone polymer?
Me3SiCl
PhSiCl3
MeSiCl3
Me2SiCl2
21.
The repeating unit in silicone is_______.
SiO2
22.
The basic structural unit of silicates is _______.
\(\left( SiO_{ 3 } \right) ^{ 2- }\)
\(\left( SiO_{ 4 } \right) ^{ 2- }\)
\(\left( Sio \right) ^{ - }\)
\(\left( SiO_{ 4 } \right) ^{ 4- }\)
23.
Oxidation state of carbon in its hydrides _______.
+4
-4
+3
+2
24.
Carbon atoms in fullerene with formula C60 have _______hybridisation.
sp3 hybridised
sp hybridised
sp2 hybridised
partially sp2 and partially sp3 hybridised
25.
The element that does not show catenation among the following p-block elements is ________.
Carbon
silicon
Lead
germanium
26.
In diborane, the number of electrons that accounts for banana bonds is ________.
six
two
four
three
27.
Which of the following metals has the largest abundance in the earth’s crust?
Aluminium
Calcium
Magnesium
Sodium
28.
Which among the following is not a borane?
B2H6
B3H6
B4H10
none of these
29.
30.
An aqueous solution of borax is________.
neutral
acidic
basic
amphoteric
1.
(a)
\(\left[\mathrm{Si}_{2} \mathrm{O}_{5}\right]_{\mathrm{n}}^{2 \mathrm{n}-}\)
2.
(a)
Asbestos
3.
(c)
COCI2
4.
(a)
1.38 Å
5.
(b)
sp3
6.
(c)
potash alum
7.
(a)
[Na2SO4.Al2(SO4)3.24H2O]
8.
(a)
F
9.
(b)
p
10.
(b)
graphite
11.
(a)
It is a strong tribasic acid
12.
(b)
\( \mathrm{H}^{+} \& \left[\mathrm{BF}_{4}\right]^{-} \)
13.
(a)
Al < Ga < In < Tl
14.
(a)
Metal borides
15.
(d)
Al, Cu, Mn, Mg
16.
(a)
| A | B | C | D |
| 2 | 1 | 4 | 3 |
17.
(d)
Feldspar is not aluminosilicate
18.
(a)
Tetrahedral
19.
(d)
dry ice
20.
(a)
Me3SiCl
21.
(b)
22.
(d)
\(\left( SiO_{ 4 } \right) ^{ 4- }\)
23.
(a)
+4
24.
(c)
sp2 hybridised
25.
(c)
Lead
26.
(c)
four
27.
(a)
Aluminium
28.
(b)
B3H6
29.
(d)
30.
(c)
basic
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