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SAI INTERNATIONAL SCHOOL
                                                      CLASS-VII
                                             SUBJECT- CHEMISTRY
                              TOPIC-PHYSICAL AND CHEMICAL CHANGES
                       SUB TOPIC- BROWNING OF FRUITS AND VEGETABLES


                                           PRACTICE WORKSHEET-2


               OBJECTIVE/MCQs

                   1.    The chemical formula of rust is
                             a)  Fe2O3.xH2O
                             b)  Fe2O3
                             c)  FeO
                             d)  Fe(OH)2
                   2.    What is depositing a layer of zinc on iron called?
                             a)  Galvanisation
                             b)  Crystallisation
                             c)  Sublimation
                             d)  Layering
                   3.    The reaction where heat is evolved is called a __________reaction
                             a)  Exothermic
                             b)  Endothermic
                             c)  Both a) and b)
                             d)  Precipitation
                   4.     When magnesium is treated with oxygen, the product formed Is_
                         --------------------
                             a)  Magnesium dioxide
                             b)  Magnesium oxide
                             c)  Magnesium hydroxide
                             d)  Carbon dioxide
                   5.    When milk is converted to curd, an acid is produced. It is________
                             a)  Citric acid
                             b)  Formic acid
                             c)  Lactic acid
                             d)  Acetic acid
                   6.     When carbon dioxide is passed through lime water, a……. colour layer is
                         formed.
                             a)  Red
                             b)  Yellow
                             c)  Green
                             d)  White









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