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SAI International School
                                                  Subject-Chemistry

                                                           Cl-IX
                    Topic- Rutherford’s model of an atom, Bohr’s model of an atom,
                                        atomic number and mass number

                                                 Practice Worksheet
                Q.1 .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

                Q2A 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

               Q3. Rusting of an article made up of iron is called
               (a) corrosion and it is a physical as well as chemical change
               (b) dissolution and it is a physical change
               (c) corrosion and it is a chemical change
               (d) dissolution and it is a chemical chang


               Q. 4.      Which of the following are homogeneous in nature?
               (i) Ice                           (ii) Wood                        (iii) Soil                      (iv) Air
               (a) (i) and (iii)            (b) (ii) and (iv)              (c) (i) and (iv)           (d) (iii) and (iv)

               Q5  Which of the following has maximum number of atoms?

               (a) 18 g of H20                                                  (b) 18 g of 02
               (c) 18 g of C02                                                   (d) 18 g of CH4



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               Q.6. Will  Cl and  Cl have different valencies? Justify your answer.
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