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Published on: 13/10/2020
12th Standard Chemistry Solid State 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.
The defect arising due to an ion occupying interstitial position is called _______.
Schottky defect
Metal excess defect
Frenkel defect
Metal deficiency defect
2.
Crystalline solids are also called as _______.
supercooled liquids
true solids
pseudo solids
all the above
3.
The wavelength of X-ray is in the order of _______.
10-8 cm
10-10 c
10-8 m
10-10 nm
4.
In a simple cubic cell, each point on a corner is shared by _______.
One unit cell
Two unit cell
8 unit cell
4 unit cell
5.
In the Bragg's equation for diffraction of X-rays, 'n' represents _______.
The number of moles
Avogadro number
A quantum number
Order of reflection
6.
A regular three dimensional arrangement of identical points in space is called _______.
Unit cell
Space lattice
Primitive
Crystallography
7.
In a body centred cubic unit cell, a metal atom at the centre of the cell is surrounded by how many other metal atoms?
12
4
6
8
8.
Which of the following statement is correct?
On increasing temperature, the coordination number of solid remains unchanged.
On increasing pressure, the co-ordination number of solid increases.
On increasing pressure, the co-ordination number of solid decreases.
On increasing temperature, the coordination number of solid increases
9.
A solid with formula ABC3 would probably have, _______.
A at body centre, B at face centres and C at corners of the cube
A at corners of cube, B at body centre, C at face centre
A at corners of hexagon, B at centres of the hexagon and C inside the hexagonal unit cell
A at corner, B at face centre, C at body centre
10.
Which of the following defects decreases the density of the crystal?
Interstitial defect
Vacancy defect
Frankel defect
None of these above
11.
Schottky defect in a crystal is observed when ______.
unequal number of anions and anions are missing from the lattice
Equal number of cations and anions are missing from the lattice
an ion leaves its normal site and occupies an interstitial site
no ion is missing from its lattice
12.
The yellow colour in NaCl crystal is due to ________.
excitation of electrons in F centers
reflection of light from Cl- ion on the surface
refraction of light from Na+ ion
all of the above
13.
The radius of an atom is 300pm, if it crystallizes in a face centered cubic lattice, the length of the edge of the unit cell is ________.
488.5pm
848.5pm
884.5pm
484.5pm
14.
A solid compound XY has NaCl structure if the radius of the cation is 100pm, the radius of the anion will be ________.
\(\left( \frac { 100 }{ 0.414 } \right) \)
\(\left( \frac { 0.732 }{ 100 } \right) \)
100 x 0.414
\(\left( \frac { 0.414 }{ 100 } \right) \)
15.
The ionic radii of A+ and B− are 0.98 x 10-10 m and 1.81 x 10-10 m. the coordination number of each ion in AB is ________.
8
2
6
4
16.
In a solid atom M occupies ccp lattice and \(\left( \frac { 1 }{ 3 } \right) \) of tetrahedral voids are occupied by atom N. Find the formula of solid formed by M and N ________.
MN
M3N
MN3
M3N2
17.
The number of unit cells in 8 gm of an element X (atomic mass 40) which crystallizes in bcc pattern is (NA is the Avogadro number)________.
6.023 x 1023
6.023 x 1022
60.23 x 1023
\(\left( \frac { 6.023\times { 10 }^{ 23 } }{ 8\times 40 } \right) \)
18.
The ratio of close packed atoms to tetrahedral hole in cubic packing is ________.
1:1
1:2
2:1
1:4
19.
Graphite and diamond are ________.
Covalent and molecular crystals
ionic and covalent crystals
both covalent crystals
both molecular crystals
20.
1.
(c)
Frenkel defect
2.
(b)
true solids
3.
(a)
10-8 cm
4.
(c)
8 unit cell
5.
(d)
Order of reflection
6.
(b)
Space lattice
7.
(d)
8
8.
(b)
On increasing pressure, the co-ordination number of solid increases.
9.
(b)
A at corners of cube, B at body centre, C at face centre
10.
(b)
Vacancy defect
11.
(b)
Equal number of cations and anions are missing from the lattice
12.
(a)
excitation of electrons in F centers
13.
let edge length = a
\(\sqrt{2a} = 4r\)
\(a = \frac{4 \times 300}{\sqrt {2}}\)
a = 600 x 1.414
a = 848.4 pm
14.
For a fcc structure = rx+ / ry- = 0.414
Given that rx+ = 100 pm
ry = 100pm/0.414
15.
\(\left( \frac { r_{c^+} }{ r_{A^-} } \right) \) = \(\left( \frac { 0.98 \times 10^{-10 }}{ 1.81 \times 10^{-10} } \right) = 0.54\)
It is in the range of 0.414 to 0.732, hence the coordination number of each ion is 6.
16.
If the total number of M atoms is n, then the number of tetrahedral voids = 2n
Given that \(\left( \frac { 1 }{ 3 } \right) ^{rd}\) of tetrahedral voids are occupied.
i.,e \(\left( \frac { 1 }{ 3 } \right) \times 2n\) are occupied by N atoms
\(\therefore\)M : N = n : \(\left( \frac { 2 }{ 3 } \right) n\)
= 1 : \(\frac { 2 }{ 3 }\)
Hence M3N2 = 3 : 2
17.
In bcc unit cell,
2 atoms = 1 unit cell
Number of atoms in 8 g of element is, Number of moles = 8g / 40 g mol-1 = 0.2 mol
1 mole contains 6.023 x1023 atoms
0.2 mole contains 0.2 x 6.023 x 1023 atoms
[1 unit cell / 2 atoms] x 0.2 x 6.023 x 1023
= 6.023 x 1022 unit cells.
18.
If number of close packed atoms = N, then
The number of Tetrahedral holes formed = 2N
The number of Octahedral holes formed = N
Therefore, N:2N = 1:2
19.
(c)
both covalent crystals
20.
(a)
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