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SAI International School
                                                       Class-IX
                                                Subject-Chemistry
                                      Topic-Matter in our surroundings
                       Sub topic-Nature & Characteristics of particles of matter
               OBJECTIVE QUESTIONS
               Q.1      Assertion:Liquids diffuse less easily as compared togases.

                        Reason:Intermolecular forces are greater in gases.


               Q.2      Assertion: Gases have high kinetic energy.
                        Reason : Gases can flow
               Q.3      Assertion:Gases are highly compressible
                        Reason :The intermolecular space in gases is very high.
               Q.4      The property to flow is unique to fluids. Which one of the following
                        statements is correct?

                        (a) Only gases behave like fluids
                        (b) Gases and solids behave like fluids

                        (c) Gases and liquids behave like fluids
                        (d) Only liquids are fluids
               Q.5      A few substances are arranged in the increasing order of ‘forces of

                        attraction’ between their particles. Which one of the following represents a
                        correct arrangement?

                        (a) Water, air, wind
                        (b) Air, sugar, oil

                        (c) Oxygen, water, sugar
                        (d) Salt, juice, air




               SUBJECTIVE
               Q.1      Why do gases neither have fixed volume nor fixed shape?

               Q.2      Solids cannot be compressed Justify?
               Q.3      Give reasons:
                           a)  Gases completely fill the vessel in which they are kept.
                           b)  Solids do not flow.
               Q.4       A rubber band can change its shape on stretching. Will you classify it as
                         solid or not? Justify?
               Q.5      A student placed a gas jar containing air in the upside-down position over
                        a gas jar full of reddish brown bromine vapours. He observed that the
                        reddish brown colour spread upwards into the jar containing air. Based on



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