1.Some substances cannot exist in the gaseous state; others cannot exist in the liquid state, and some
cannot exist either in the gaseous or the liquid state. Giving suitable examples justify the above
statement.
2. A gas jar containing air is inverted over another containing Nitrogen dioxide gas which is brown in
Colour and heavier than air.After sometime brown colour is seen in the inverted gas jar too.Identify
the phenomenon associated with this observation.
3. What makes a sample of matter :
a) a solid b) a liquid c) a gas
4. Water as ice has a cooling effect, whereas water as steam may cause severe burns.Explain
these observations.
5. Which gas is called dry ice? Why?
6. How will you demonstrate the following:
a) Particles of matter attract each other.
b) Particles of matter have space between them
c) Particles of matter are continuously moving.
7. Why are gases compressible but not liquids?
8. What is plasma? Give examples in which matter is present in the plasma state.
9. A sample of water under study was found to boil at 1040 C at normal temperature and pressure.
Is the water pure? Will this water freeze at 00
C? Comment.
10. You want to wear your favourite dress to a party, but the problem is that it is still wet
after a wash. What steps would you take to dry it faster?
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