11
MCQ (Single Correct Answer)
Which of the following is not the characteristic of ionic solids?
A
Very low value of electrical conductivity in the molten state
B
Brittle nature
C
Very strong forces of interactions
D
Anisotropic nature
12
MCQ (Single Correct Answer)
Graphite is a good conductor of electricity due to the presence of ...........
A
Ione pair of electrons
B
free valence electrons
C
cations
D
anions
13
MCQ (Single Correct Answer)
Which of the following oxides behaves as conductor or insulator depending upon temperature?
A
TiO
B
$\mathrm{SiO}_2$
C
$\mathrm{TiO}_3$
D
MgO
14
MCQ (Single Correct Answer)
Which of the following oxides shows electrical properties like metals?
A
$\mathrm{SiO}_2$
B
MgO
C
$\mathrm{SO}_2(\mathrm{~s})$
D
$\mathrm{CrO}_2$
15
MCQ (Single Correct Answer)
The lattice site in a pure crystal cannot be occupied by ........... .
A
molecule
B
ion
C
electron
D
atom