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SAI INTERNATIONAL SCHOOL

                                                    CLASS - VIII

                                              Subject – CHEMISTRY

                       Chapter – CHEMICAL EFFECTS OF ELECTRIC CURRENT

           TOPIC – Electrolysis, Simple circuit of electrolysis and Applications of the
                                     Chemical Effects of Electric Current


                                               HOME ASSIGNMENT

        Objective:



        Q. No.                                            Questions
           1.     Weak conduction of electricity cannot be determined in which one of the following:
                     a)  Electrical Tester
                     b)  Electric Bulb
                     c)  LED
                     d)  Magnetic Compass
           2.     Electric current produces __________ field.
                  a) Physical  b) Chemical  c) Magnetic  d)Complex.
           3.     Which among the following is not an electrolyte:
                     a)  Salt solution
                     b)  Sugar solution
                     c)  Alcohol.
                     d)  Both (b) and (c)
           4.     An electric lamp glows due to:
                     a)  Chemical effect
                     b)  Magnetic effect
                     c)  Heating effect
                     d)  Electrodes
           5.     Which of the following statements is incorrect?
                     a)  Anode is an electrode connected to the positive terminal of the battery.
                     b)  Pure water is poor conductor of electricity.
                     c)  Electrolysis is used in the refining of impure metals.
                     d)  Ions can have only a positive charge.
        Subjective:



        Q. No.                                     Questions                                         Marks
           1.     This chemical deposition produced by passing an electric current through              1
                  a conducting liquid is called __________.
           2.     What do you mean by ‘Chemical effects of electric current’?                           1
           3.     The formation of greenish blue spot around the positive electrode inserted            1
                  in the surface of a cut potato shows which effect of electric current?
           4.     Explain, what happens at the two carbon electrodes, when electric current             3
                  is passed through an acidified water?
           5.     Mention any threeapplications of chemical effects of electric current.                3





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