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Q 1/20
Score 0
Which of the following is an amorphous solid?
45
Quartz glass (SiO2)
Chrome alum
Graphite (C)
Silicon Carbide (SiC)
Q 2/20
Score 0
Which of the following statement is not true about amorphous solids?
45
On heating they may become crystalline at certain temperature
Amorphous solids can be moulded by heating
They are anisotropic in nature
They may become crystalline on keeping for long time
20 questions
Q.
Which of the following is an amorphous solid?
1
45 sec
Q.
Which of the following statement is not true about amorphous solids?
2
45 sec
Q.
The sharp melting point of crystalline solids is due to____
3
45 sec
Q.
Iodine molecules are held in the crystal lattice by __________
4
45 sec
Q.
Which of the following is a network solid?
5
45 sec
Q.
Graphite is a good conductor of electricity due to the presence of_____
6
45 sec
Q.
Cations are present in the interstitial sites in _______
7
45 sec
Q.
Schottky defect is observed in crystals when_______
8
45 sec
Q.
Which of the following point defects are shown by AgBr (s) crystals?
(A) Schottky defect (B) Frenkel defect
(C) Metal excess defect (D) Metal deficiency defect
9
45 sec
Q.
The correct order of the packing efficiency in the different types of unit cells is_____
10
45 sec
Q.
Which of the following defects is also known as dislocation defect?
11
45 sec
Q.
In the cubic close packing, the unit cell has ______
12
45 sec
Q.
The edge lengths of the unit cells in terms of the radius of the spheres constituting fcc, bcc and simple cubic unit cell are respectively____
13
45 sec
Q.
How many unit cells are present in a cubic shaped ideal crystal of NaCl of mass 1.0 g?
14
45 sec
Q.
In a fcc arrangement of P and Q, where P atoms are at the corner of the unit cell, Q atoms at the face centers and two atoms are missing from the two corners in each unit cell, then the formula of the compound is
15
45 sec
Q.
The white ZnO turns yellow on heating because of
16
45 sec
Q.
The ionic radii of A+ and B- ions are 0.98 x 10 -10 m and 1.81 x 10 -10 m. The coordination number of each ion in AB is
17
45 sec
Q.
The cubic unit cell of Al (molar mass = 27) has an edge length of 405 pm. Its density is 2.7 g cm -3. The cubic unit cell is
18
45 sec
Q.
A compound of formula A2B3 has the hcp lattices. Which atom forms the hcp lattice and what fraction of tetrahedral voids is occupied by the other atoms?
19
45 sec
Q.
Experimentally it was found that a metal oxide has formula M0.98 O. Metal M is present as M2+ and M3+ in its oxide. Fraction of the metal which exists as M3+ would be
