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Chemistry - 9 Chapter - 6
State of Matter
Test - 11
1.
When hydrogen atom is attached to any one of fluorine, oxygen and nitrogen atoms, there appear strong dipole forces which are called?
a) Intermolecular forces
b) hydrogen bonding
c) Cohesive forces
d) Vander walls forces
2.
The temperature at which a solid changes into a liquid is called?
a) Boiling point
b) Point of evaporation
c) Melting point
3.
Boiling point is the temperature at which the vapor pressure of a liquid becomes ______the external pressure present on its surface.
a) equal to
b) lesser than
c) greater than
4.
melting point of sodium chloride is very high due to very strong electromagnetic forces between sodium and chloride ions.
a) True
b) False
5.
Solid substances maintain a certain volume and shop due to very strong cohesive forces between their atoms and molecules.
a) True
b) False
6.
When a solid substance is heated kinetic energy of particles?
a) No effect
b) Decreases
c) Increases
7.
When a solid, upon heating, change directly into vapors instead of changing into liquid. This is called?
a) Condensation
b) Sublimation
c) Evaporation
d) Distillation
8.
Evaporation occurs only when temperature of a liquid is raised?
a) True
b) False
9.
Particles of solids are more strongly held than liquids?
a) True
b) False
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