Page 2 - 4. HOME ASSIGNMENT- EFFECT OF PRESSURE ON STATES OF MATTER
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a) produce a cooling effect
                         b) produce artificial smoke.
                         c) extinguish the fire.
                         d) all of the above
                 Q.9     LPG can be prepared by:
                             a)  Liquefaction of petroleum gases.
                             b)  Liquidation.
                             c)  By decreasing the temperature and increasing the pressure.
                             d)  All of the above.
                 Q.10    The inter molecular spaces in solids are less hence
                             a)  They cannot be decreased or increased by changing the pressure
                             b)  They cannot be decreased or increased by changing the
                                temperature
                             c)  They can be decreased or increased by changing the temperature.
                             d)  They can be increased by changing both the temperature and
                                pressure.


               SUBJECTIVE
                 Q.1     How can we liquefy a gas?
                 Q.2     Solid CO2 is also known as dry ice.  Why
                 Q.3     Write the full form of: CNG   &   LPG and how are they prepared?
                 Q.4     Give reasons: gases are more compressible than solids or liquids.
                 Q.5     Explain with an activity the effect of pressure on change of state.

               NCERT Textbook-Std-IX-Science
               Q.4 Pg no 9,
































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