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SAI International School
                                                           Cl-X

                                                    Subject-Chemistry
                 Ch-1(Full) , Ch- 2(Full) ,Ch-3(Full) & Ch-4 (covering module_28 to 30)
                                                     Worksheet: 10
               Objective-
               Q1.When Ca(NO 3) 2 is heated, it gives CaO, NO 2(g) andO 2(g).The correct
               number of moles of Ca(NO 3) 2,CaO,NO 2(g) and O 2(g) are present in the
               reaction are respectively
               (a) 2, 1, 3, 2 (b) 2, 2, 4, 1(c) 2, 2, 2, 1 (d) 1, 2, 4, 1
                 [  A+D ] (1mark)

                Q2. Following reaction is used for the preparation of oxygen gas in the
                laboratory.         Heat
                2KClO3(s)2KCl (s) + 3O2(g)
               Catalyst
               Which of the following statement (s) is (are) correct about the reaction?
               [  A+Av ] (1mark)

               (a) It is a decomposition reaction and endothermic in nature.
               (b) It is a combination reaction.
               (c) It is a decomposition reaction and accompanied by the release of heat.
               (d) It is a photochemical decomposition reaction and exothermic in nature.

               Q3. In one of the industrial processes used for manufacture of sodium
               hydroxide, a gas Xis formed as by-product. The gas Xreacts with lime water
               to give a compound Y which is used as a bleaching agent in chemical
               industry. The compound X andY could be[
               [A+Av ] (1mark)

               (a) H2 andNaHCO3respectively
               (b) CO2 andCaOCl2respectively
               (c) Cl2andCaOCl2 respectively
               (d) Cl2andNaHCO3respectively

               Q4. Acids like HClO4 which dissociate almost completely in water are
               called_______acids.                                                              [  A+Av ] (1mark)


                       DIRECTION:Each of these questions contains an Assertion followed by
                       Reason. Read them carefully and answer the question on the basis of
                       following options. You have to select the one that best describes the two
                       statements.


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