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Published on: 13/10/2020
12th Standard Chemistry Solid State 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.
The coordination number of each sphere in body centred cubic packing is _______.
2
4
6
8
2.
ABAB type of packing is called _________.
hexagonal close packing
cubic close packing
tetragonal close packing
none of the above
3.
The size of the anion in Frenkel defect crystal is_______.
larger than the cation
smaller than the cation
equal in size with cation
both are larger in size
4.
In edge centred lattice, an atom in the edge is shared by________.
4 unit cell
12 unit cell
2 unit cell
8 unit cell
5.
The force that binds a metal ion to a number of electrons within its sphere of influence is known as_________ bond.
covalent
ionic
metallic
co-ordinate
6.
Three atoms P, Q and R crystallize in a cubic solid lattice having P atom at corners Q atom at body centre and R atom at the face centres. Identify formula of the compound _______.
PQR
PQR2
PQR3
P3QR
7.
Which type of solids will have the highest melting point?
Ionic crystals
Network covalent solid
Molecular solids
Metallic crystals
8.
Which one of the following crystal has 8 : 8 structure?
MgF2
CsCl
KCl
NaCl
9.
A binary solid A+B has a structure with B- ions constituting the lattice and A+ ions occupying 25% tetrahedral holes. Formula of the solid is _______.
A2B
AB2
AB
AB4
10.
What is the relation between diamond and graphite?
Polymorphous
Isomer
Isotope
Isomorphous
11.
Which of the following is characteristic of ionic solids?
Very low value of electrical conductivity in the molten state
Brittle nature
Very strong forces of attractions
Anisotropic nature
12.
In which of the following arrangements, octahedral voids are formed?
fcc
bcc
simple cubic
hcp
13.
The crystal with a metal deficiency defect is ________.
NaCl
FeO
ZnO
KCl
14.
The cation leaves its normal position in the crystal and moves to some interstitial position, the defect in the crystal is known as _____.
Schottky defect
F center
Frenkel defect
non-stoichiometric defect
15.
If ‘a’ stands for the edge length of the cubic system sc, bcc, and fcc. Then the ratio of radii of spheres in these systems will be respectively ________.
\(\left( \frac { 1 }{ 2 } a;\frac { \sqrt { 3 } }{ 2 } a;\frac { \sqrt { 2 } }{ 2 } a \right) \)
\(\left( \sqrt { 1a } :\sqrt { 3a } :\sqrt { 2a } \right) \)
\(\left( \frac { 1 }{ 2 } a:\frac { \sqrt { 3 } }{ 4 } a:\frac { 1 }{ 2\sqrt { 2 } } a \right) \)
\(\frac { 1 }{ 2 } a:\sqrt { 3 } a:\frac { 1 }{ \sqrt { 2 } } a\)
16.
The fraction of total volume occupied by the atoms in a simple cubic is ________.
\(\left( \frac { \pi }{ 4\sqrt { 2 } } \right) \)
\(\left( \frac { \pi }{ 6 } \right) \)
\(\left( \frac { \pi }{ 4 } \right) \)
\(\left( \frac { \pi }{ 3\sqrt { 2 } } \right) \)
17.
CsCl has bcc arrangement, its unit cell edge length is 400pm, its inter atomic distance is ________.
400pm
800pm
\(\sqrt { 3 } \times 100pm\)
\(\left( \frac { \sqrt { 3 } }{ 2 } \right) \times 400pm\)
18.
The composition of a sample of wurtzite is Fe0.93 O1.00 what % of Iron present in the form of Fe3+?
16.05%
15.05%
18.05%
17.05%
19.
Solid CO2 is an example of ________.
Covalent solid
metallic solid
molecular solid
ionic solid
20.
An ionic compound Ax By crystallizes in fcc type crystal structure with B ions at the centre of each face and A ion occupying corners of the cube the correct formula of Ax, By is ________.
AB
AB3
A3B
A8B6
1.
(d)
8
2.
(a)
hexagonal close packing
3.
(a)
larger than the cation
4.
(b)
12 unit cell
5.
(c)
metallic
6.
(c)
PQR3
7.
(b)
Network covalent solid
8.
(b)
CsCl
9.
(b)
AB2
10.
(a)
Polymorphous
11.
(c)
Very strong forces of attractions
12.
(d)
hcp
13.
(b)
FeO
14.
(c)
Frenkel defect
15.
sc ⇒ 2r = a
⇒ r = a/2
bcc ⇒ 4r = \( \sqrt{3a} \) ⇒ r = \(\frac { \sqrt{3a}} {4}\)
fcc ⇒ 4r ⇒ \( \sqrt{2a} \) ⇒ r = \(\frac { \sqrt{2a}} {4} = \frac { a} {2\sqrt{2a}}\)
\(\left( \frac { a }{ 2 } :\frac { \sqrt { 3 } }{ 4 } a:\frac { a }{ 2\sqrt { 2 } } \right) \)
16.
(b)
\(\left( \frac { \pi }{ 6 } \right) \)
17.
\(3 \sqrt{a} = r_{C_{s+}} + 2r_{C_{f-}} + r_{C_{s+}} \)
\(\left( \frac { \sqrt { 3 } }{ 2 } \right) a = r_{C_{s+}} + r_{C_{f-}} \)
\(\left( \frac { \sqrt { 3 } }{ 2 } \right) \times 400\)= inter ionic distance
18.
(b)
15.05%
19.
Lattice points are occupied by CO2 molecules
20.
Number of A ions = Nc/8 = 8/8 = 1
Number of B ions = Nf/2 = 6/2 = 3
Simplest formula = AB3
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