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Chemistry - 9 Chapter - 6
State of Matter
Test - 7
1.
Why in ice large empty spaces exist between molecules of water?
a) Due to hydrogen bonding
b) Due to low temperature
c) Due to impurities
d) To air bubbles
2.
Why ice floats in water?
a) Due to hydrogen bonding intermolecular distance decreases, increasing the volume of ice than water. This makes the ice to float.
b) Due to hydrogen bonding intermolecular distance increases, increasing the volume of ice than water. This makes the ice to float.
3.
How fish remains alive throughout the year even in frozen lakes?
a) Due to larger volume of ice than water it floats on water. Ice being a bad conductor of heat, does not allow water beneath it to freeze and fish survives.
b) Due to smaller volume of ice than water it floats on water. Ice being a bad conductor of heat, does not allow water beneath it to freeze and fish survives.
4.
Ice is a good conductor of heat.
a) False
b) True
5.
Molecules can be seen by microscope?
a) False
b) True
6.
What are the meanings of word diffusion?
a) A process during which something spread or scatters like scattering of light in many directions.
b) A process during which something spread or scatters like scattering of light in one direction.
7.
Define Diffusion?
a) The movement of the molecules from a higher concentration to a lower concentration is called diffusion.
b) The movement of the electrons from a higher concentration to a lower concentration is called diffusion.
8.
How free movement of molecules can be proved?
a) By phenomenon of infusion
b) By phenomenon of diffusion
9.
What are the examples of diffusion?
a) Gases: Open bottle of perfume in room. Its smell will spread in the entire room.
b) Liquid : Open bottle of perfume in room. Its smell will spread in the entire room.
10.
Define Brownian movement?
a) The free movement of the molecules of gases and liquids is called Brownian movement.
b) The restricted movement of the molecules of gases and liquids is called Brownian movement.
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