6
MCQ (Single Correct Answer)
Which of the following statement is not true about amorphous solids?
A
On heating they may become crystalline at certain temperature
B
They may become crystalline on keeping for long time
C
Amorphous solids can be moulded by heating
D
They are anisotropic in nature
7
MCQ (Single Correct Answer)
The sharp melting point of crystalline solids is due to ..........
A
a regular arrangement of constituent particles observed over a short distance in the crystal lattice
B
a regular arrangement of constituent particles observed over a long distance in the crystal lattice
C
same arrangement of constituent particles in different directions
D
different arrangement of constituent particles in different directions
8
MCQ (Single Correct Answer)
Iodine molecules are held in the crystals lattice by ...........
A
London forces
B
dipole-dipole interactions
C
covalent bonds
D
coulombic forces
9
MCQ (Single Correct Answer)
Which of the following is a network solid?
A
$\mathrm{SO}_2$ (solid)
B
$\mathrm{I}_2$
C
Diamond
D
$\mathrm{H}_2 \mathrm{O}$ (ice)
10
MCQ (Single Correct Answer)
Which of the following solids is not an electrical conductor?
1. $\mathrm{Mg}(\mathrm{s})$
2. TiO (s)
3. $\mathrm{I}_2$ (s)
4. $\mathrm{H}_2 \mathrm{O}(\mathrm{s})$
A
Only 1
B
Only 2
C
3 and 4
D
2, 3 and 4