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Published on: 13/10/2020
12th Standard Chemistry p Block Elements I English Medium Free Online Test One Mark Questions with Answer Key 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.
Questions + Answers key
Take MCQ Chemistry Test
1.
Silicones are ______.
ortho silicates
water repellent thermal insulators
both (a) and (b)
None of these
2.
Allotropy is due to ______.
difference in chemical properties
difference in the number of atoms in the molecules
difference in the arrangement of atoms in the molecules in the crystal
None of these
3.
Aluminium is used for making alloys because of its _____
resistance to corrosion
poor conductivity
heaviness
all of these
4.
Oxidation state exhibited by group 13 elements is ______
+1, +2 and +3
+1 and +3
+1 and +4
+2 +3 and +4
5.
On moving down the group 13, density ______
decreases
increases
First decreases then increases
remains same
6.
Boron compounds behave as Lewis acid, because of their _______.
ionisation property
acidic nature
covalent nature
electron deficient nature
7.
Identify the electron - deficient species
(BH3)2
(SiH3)2
PH3
(CH3)2
8.
Which one is correct statement for zeolite?
Zeolites are aluminosilicates having three dimensional framework
Hydrate zeolites are used as ion exchangers in hardening of soft water
Zeolites are alumino silicates
all the above
9.
Graphite has _______.
2-d sheet structure
Vander waals force between successive layers of carbon sheets
Sp2 hybridised carbon linked with other three carbon atoms in hexagonal planar structure
all the above
10.
Which one of the following compounds has similar structure to that of graphite?
Boron nitride
Boron Carbide
Aluminium Carbide
Aluminium Oxide
11.
Select the incorrect statement regarding B2H6.
It contains B-B ionic bond
Each boron is Sp3 hybridised
It has two types of hydrogen bonds
it is used as a reducing agent
12.
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
13.
Thermodynamically the most stable form of carbon is________.
Diamond
graphite
Fullerene
none of these
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.
The geometry at which carbon atom in diamond are bonded to each other is _______.
Tetrahedral
hexagonal
Octahedral
none of these
16.
The repeating unit in silicone is_______.
SiO2
17.
Oxidation state of carbon in its hydrides _______.
+4
-4
+3
+2
18.
In diborane, the number of electrons that accounts for banana bonds is ________.
six
two
four
three
19.
Which of the following metals has the largest abundance in the earth’s crust?
Aluminium
Calcium
Magnesium
Sodium
20.
1.
(c)
both (a) and (b)
2.
(c)
difference in the arrangement of atoms in the molecules in the crystal
3.
(a)
resistance to corrosion
4.
(b)
+1 and +3
5.
(b)
increases
6.
(d)
electron deficient nature
7.
(a)
(BH3)2
8.
(d)
all the above
9.
(d)
all the above
10.
(a)
Boron nitride
11.
(a)
It contains B-B ionic bond
12.
(a)
Al < Ga < In < Tl
13.
(b)
graphite
14.
(b)
K3[AiF6]
15.
(a)
Tetrahedral
16.
(b)
17.
(a)
+4
18.
(c)
four
19.
(a)
Aluminium
20.
(d)
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