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Chemistry - 9 Chapter - 6
State of Matter
Test - 15
1.
The process in which solids directly change into vapours without heating is called
a) Sublimation
b) Evaporation
c) Diffusion
d) Condensation
2.
Which one of the following substances has no definite shape but fixed volume
a) Solid
b) Vapours
c) Liquid
d) Gas
3.
NaCl is the type of solid
a) Covalent (Non-polar)
b) Ionic
c) Covalent (polar)
d) Co-ordinate covalent
4.
The most electronegative atom is
a) Bromine
b) Fluorine
c) Iodine
d) Chlorine
5.
Intermolecular forces are of three type and are collectively called
a) Van der wall's forces
b) Electrostatic forces
c) Dipole-dipole forces
d) Hydrogen bonding
6.
The melting point of NaCl is:
a) 196
o
C
b) 801
o
C
c) 100
o
C
d) 0
o
C
7.
The free movement of molecules makes them:
a) Non-electorlyte
b) Conductor
c) Non-conductor
d) Electrolyte
8.
0
o
C temperature of water is called its
a) Melting point
b) Freezing point
c) Boiling point
d) Both melting and freezing point
9.
The cohesive forces in the gas molecules are extremely
a) Weak
b) Moderate
c) Strong
d) Very strong
10.
It is easy to compress air as compared to water because
a) The distance between the air molecules is neither small nor large
b) The distance between the air molecules is very large
c) The distance between the air molecules is very small
d) Air is compound of different gases
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