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Chemistry - 9 Chapter - 6
State of Matter
Test - 3
1.
Covalent solids consist of ______.
a) Atoms only
b) Molecules and atoms
c) Molecules only
2.
In an ionic solid, ions are held together by ______.
a) Electromagnetic forces
b) Electrostatic forces
c) Attractive forces
d) Bonding forces
3.
In covalent solids atoms and molecules are bound by?
a) Vander walls forces
b) Covalent forces
c) All are correct
4.
Attractive forces between atoms and molecules are called?
a) Vander walls forces
b) Cohesive forces
c) Bonding forces
d) Attractive forces
5.
Define Melting point?
a) Melting point is the temperature at which a solid changes into a liquid.
b) Melting point is the temperature at which a solid changes into a gas
6.
Define Boiling point? ................> Boiling point is the temperature at which the vapor pressure of a liquid becomes equal to the internal pressure present ------------.
a) inside
b) on its surface.
7.
Why solid substances differ in their properties?
a) They differ due to different structure of ionic forces between their particles.
b) They differ due to different structure of cohesive forces between their particles.
8.
Higher the cohesive forces higher the melting point?
a) True
b) False
9.
Why the melting point of sodium chloride is very high i.e. 801
o
C?
a) Due to very strong electromenatic forces between sodium and chloride ions.
b) Due to very strong electrostatic forces between sodium and chloride ions.
10.
Melting point of sodium chloride is ______.
a) 801
o
C
b) 108
o
C
c) 801
o
F
d) 108
o
F
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