Page 2 - 2. HA (Lab WS_Expt_4)
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(a) it is cooled
                    (b) it is shaken
                    (c) it is kept undisturbed
                    (d) it is heated.
              2.     Four students A, B, C and D noted the initial colour of the solutions in test tubes I. II,
                    III and IV. After inserting
                    zinc rod in each solution and leaving it undisturbed for two hours, they noted the
                    colour of each solution again.



















                    They recorded their observations in the form of table given below:


                                   Colour of
                     Students                           I            II            III           IV
                                   solution






                                     Initial      Colourless  Colourless  Light green           Blue


                         A

                                     Final        Colourless  Colourless  Colourless  Colourless






                                     Initial      Colourless  Light yellow  Light green         Blue

                         B


                                     Final        Colourless  Colourless  Light green  Colourless






                         C           Initial      Colourless  Colourless  Light green           Blue








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