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SAI International School
                                                        Class - X

                                                  Subject-Chemistry
                Ch-1(Full) , Ch- 2(Full) , Ch-3(Full) ,Ch-4 (covering module_37 to 38) &
                                             Ch-5(covering module 39)

                                                     Worksheet: 13


               Objective-

               Q1. Balance the following chemical equations.                   [  A+Av ] (1mark)





               Q2.  Zinc granules on treating with an acid X, form the zinc sulphate (ZnSO4) salt along
               with the evolution of a gas Y which burns with a pop sound when brought near to a
               burning candle. Identify the acid X and gas evolved Y.
               a. X- Sulphuric acid and Y- Oxygen gas
               b. X- Hydrochloric acid and Y- Oxygen gas
               c. X- Sulphuric acid and Y- Hydrogen gas
               d. X- Hydrochloric acid and Y- Hydrogen gas
                                                                                                            [  A+Av ] (1mark)


               Q3.   The sample of soil from a particular place was tested for its pH value. It came out
               to be 5. Which one of the following should be added to the soil to make it suitable for the
               plant growth?
               i. Calcium chloride
               ii. Calcium Hydroxide
               iii. Calcium oxide
               Choose the correct option:

                (a)Both (i) and (ii)
                (b)Both (ii) and (iii)
                (c)Only (i)
                (d)Only (iii)
                                                                                                   [U+Av ] (1mark)




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