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formulae:
                         a)  Molecules having same kind of atoms only.
                         b)  Molecules having two different kinds of atoms.
                         c)  Molecules having three different kinds of atoms.
           Q.4       What is the atomicity of the following?                                  3        A/Av
                     a) Calcium
                     b) Sulphur
                     c) Common salt
           Q.5       a) Give one example each of                                              5        A/D
                     i)  Monovalent cation,
                     ii) Divalent molecule of an element
                     b) Find the molecular mass of the following
                     i) Calcium carbonate
                     ii) Sulphuric acid
                     iii) magnesium oxide






















































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