Page 1 - PRACTICE WORKSHEET
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SAI International School
                                                  Subject-Chemistry

                                                           Cl-IX
                                           Topic-Chapter1,2,3 and 4 full
                                                 Practice Worksheet

                Q.1 In which of the following, the particles have highest forces of attraction?
               (a)Water
               (b) NaCl (solid),
               (c) ice
               (d) wax

                Q2. Substance ‘A’ has high compressibility and can be easily liquefied. It can take up
                the shape of any container. Predict the nature of the substance.
                (a) Gas
                (b) Solid
                (c) Liquid and Gas
                (d) Liquid

               Q3.  An unknown substance ‘A’ on thermal decomposition produces ‘B’ and ‘C’. What is
               ‘A’—an element, a compound or a mixture?

               Q. 4  Identify the elements from the following substances: sulphur, brine, hydrochloric
               acid, water, neon, paper, sugar.

               Q5 . Which of the following are aerosols?


               Milk, clouds, butter, face cream, jelly, smoke



               Q.6. Calculate the formula unit mass of sodium carbonate (Na2CO3.10H2O).



               Q.7. (a)An element ‘A’ has valency +3, while another element ‘B’ has valency -2. Give
               the formula of their compound formed when ‘A’ reacts with ‘B’.
               (b) Valency of an element X is 3. Write the chemical formula of its oxide.





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