Page 2 - 2. HA-WS -13 Ch-5 CLASSIFICATION BY DOB.& NEWL.
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Q4. In electrolytic refining, the cathode is made up of

               a) Pure metal             b) Impure meta                  c) Alloy                     d) Metallic sal


                                                                                                                        [ A+Av ] (1mark)

               .
               Q5. Which of the following represent the correct order of decreasing reactivity?

               a) Mg > Al > Zn > Fe


               b) Mg > Zn > Al > Fe

               c) Al > Zn > Fe > Mg


               d) Mg > Fe > Zn > Al

                                                                                                     [ U+Av ] (1mark)

               Subjective-
               Q.6.(a) Will you be able to check if water is hard by using a detergent?
               (b) Why are the clothes rubbed with a brush or beaten with a clothes bar or agitated in
               a washing machine while cleaning them with soap or detergent?  [ A+Av ] (3mark)


               Q.7. Why does micelle formation take place when soap is added to water? Will a micelle
               be formed in other solvents such as ethanol also?                     [ A+Av ] (3mark)


                Q.8.    Explain the formation of scum when hard water is treated with soap with
               necessary chemical equations.                                                 [  A+Av ] (3mark)


                Q.9. What were the limitations(any three)of Newland’s Law of Octaves?


                                                                                                               [A+Av ] (3mark)

               Q10. (a)What change will you observe by testing soap with litmus paper (blue or red)?
                                                                                                                     [  A+Av ] (5mark)
               (b) Explain the mechanism of cleansing action of soap. -------------------------------------------
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