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Published on: 13/10/2020
12th Standard Chemistry p Block Elements I English Medium Free Online Test One Mark Questions 2020 - 2021
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.
Borax is _______.
Na2[B4O5(OH)4).8H2O
Na2[B4O5(OH)6).7H2O
Na2[B4O3(OH)8].6H2O
Na2[B4O2(OH)10).5H2O
2.
The silicates which contain discrete tetrahedral units are _______.
ortho silicates
sheet silicates
pyrosilicates
three dimensional silicates
3.
All elements except carbon have the tendency to show maximum covalency of six ______
due to presence of vacant d-orbitals
due to absence of vacant d-orbitals
due to presence of partially filled d-orbitals
due to presence of completely filled d-orbitals
4.
Elements of group 13 mainly form covalent compounds because ______
small size
electro negativity values are high
ionization energy is very high
both (a) and (c)
5.
In graphite electrons are _______.
localised on each C-atom
localised on every third C-atom
delocalised within the layer
present in anti-bonding orbital
6.
Which of the following statements about H3BO3 is not correct?
It has a layer structure in which planar BO3 units are joined by H-bonds
It is a strong tribasic acid
It is prepared by acidifying an aqueous solution of borax
It does not act as proton donor but acts as lewis acid by accepting hydroxyl ion
7.
Which of the following oxide is amphoteric?
SiO2
CO2
SnO2
CaO
8.
SiO44- ion has ____ geometry.
Triangular
Tetrahedral
Linear
Pentagonal bipyramidal
9.
Chemical formula of phosgene is_______.
COCl2
CaOCl2
CaCO3
COCI
10.
The stability of +1 oxidation state among Al, Ga, In and Tl increases in sequence _______.
TI < In < Ga < Al
In < TI < Ga < Al
Ga < In < Al < TI
Al < Ga < In < TI
11.
Lewis acid character of boron trihalides is as a follows _______.
BF3 > BCl3 > BBr3 > BI3
BCI3 > BF3 > BBr3 > BI3
BI3 > BBr3 > BCl3 > BF3
BI3 > BF3 > BCl3 > BBr3
12.
The compound that is used in nuclear reactors as protective shields and control rods is _________.
Metal borides
metal oxides
Metal carbonates
metal carbide
13.
Duralumin is an alloy of ______.
Cu, Mn
Cu, Al, Mg
Al, Mn
Al, Cu, Mn, Mg
14.
AlF3 is soluble in HF only in the presence of KF. It is due to the formation of _________.
K3[AIF3H3]
K3[AiF6]
AIH3
K[AIF3H]
15.
Which of these is not a monomer for a high molecular mass silicone polymer?
Me3SiCl
PhSiCl3
MeSiCl3
Me2SiCl2
16.
The basic structural unit of silicates is _______.
\(\left( SiO_{ 3 } \right) ^{ 2- }\)
\(\left( SiO_{ 4 } \right) ^{ 2- }\)
\(\left( Sio \right) ^{ - }\)
\(\left( SiO_{ 4 } \right) ^{ 4- }\)
17.
Carbon atoms in fullerene with formula C60 have _______hybridisation.
sp3 hybridised
sp hybridised
sp2 hybridised
partially sp2 and partially sp3 hybridised
18.
In diborane, the number of electrons that accounts for banana bonds is ________.
six
two
four
three
19.
Which among the following is not a borane?
B2H6
B3H6
B4H10
none of these
20.
An aqueous solution of borax is________.
neutral
acidic
basic
amphoteric
1.
(a)
Na2[B4O5(OH)4).8H2O
2.
(b)
sheet silicates
3.
(a)
due to presence of vacant d-orbitals
4.
(d)
both (a) and (c)
5.
(c)
delocalised within the layer
6.
(b)
It is a strong tribasic acid
7.
(c)
SnO2
8.
(b)
Tetrahedral
9.
(a)
COCl2
10.
(d)
Al < Ga < In < TI
11.
(c)
BI3 > BBr3 > BCl3 > BF3
12.
(a)
Metal borides
13.
(d)
Al, Cu, Mn, Mg
14.
(b)
K3[AiF6]
15.
(a)
Me3SiCl
16.
(d)
\(\left( SiO_{ 4 } \right) ^{ 4- }\)
17.
(c)
sp2 hybridised
18.
(c)
four
19.
(b)
B3H6
20.
(c)
basic
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