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i) Identify M and N

                                                    Concept -Rusting

               Q1.    What is the special name given to corrosion of iron?                           1

               Q2     Which type of chemical reactions is involved in rusting of iron metal?         1

               Q3     Define rusting.                                                                1

               Q4     Why is rusting not acceptable?                                                 1

               Q5     What is galvanization?                                                         1

                                       Concept -Different types of Chemical changes

               Q1.    Give an example of decomposition reaction.                                       1

               Q2     Zinc can displace copper from copper sulphate solution but copper cannot displaces zinc  1
                      from its salt solution……. Why?
               Q3     Complete the equation                                                            1

                      CuSO4 + Fe            +………

               Q4     Browning of Vegetables is a chemical change. Give an evidence for it.            1

               Q5     ________ gas evolved when baking soda is added to lemon juice.                   1

                                                 Concept- Crystallisation

               Q1.    What is crystallization?                                                         1

               Q2     Which one of the following is not a crystal?                                     1

                          a)  Copper sulphate
                          b)  Sugar
                          c)  Salt
                          d)  Talcum powder

               Q3     What is super saturated solution?                                                1

               Q4     In a _______________ Solution no more solute can be added.                       1

               Q5     Name the method by which salt will be extracted from sea water.                  1


















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