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SAI International School
                                                  Subject-Chemistry

                                          Ch-Matter in our surroundings
                Topic-Writing chemical formula, Atomicity & molecular masses, Mole
                                                         concept

                                                 Practice Worksheet
               MCQs
               Q.1 The formula of chloride of a metal M is MCl3 , then the formula of the phosphate of
               metal M will be

               (a)MPO4                                            (b) M2PO4

               (c) M3PO4                                          (d) M2PO4H3

               Q.2 Which of the following is a triatomic molecule?

               (a)Carbon-di-oxide                             (b) Ammonia

               c) Helium                                        (d) Sugar

               Q.3The number of atoms present in a molecules of a substance is called

               (a)molecularity       (b) atomicity

               (c) valency  (d) reactivity

               Q.4 The molecular formula P2O5 means that

               (a)     a molecule contains 2 atoms of P and 5 atoms of O

               (b)     the ratio of the mass of P to the mass of O in the molecule is 2 : 5

               (c)     there are twice as many P atoms in the molecule as there are O atoms

               (d)     the  ratio  of  the  mass  of  P  to  the  mass  of  O  in  the  molecule  is  5  :  2.
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