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SAI International School
                                                  Subject-Chemistry

                                          Ch-Matter in our surroundings
                 Topic-Symbols of elements, Atomic and relative atomic mases, Ions
                       (positive and negative ions), Calculation of valency of ions.

                                                 Practice Worksheet
               MCQs
               Q.1 Valency of silver in Ag2 S is

               (a) 1     (b) 2

               (c) 0     (d) 3

               Q.2 Some elements along with their symbols are enlisted in the given table:
















               Identify the incorrect representation of symbols.

                (a) 4, 5 and 6          (b) 1, 2, 4, 5 and 9

               (c)2,6,7,and8                 (d)3,6and7
               Q.3The valency of Ca in CaO is
               (a)1                                        (b) 2
               (c) 3                                       (d) None of these
               Q.4 The relative atomic mass of Magnesium is
               a) 24 g
               b) 12 g
               c) 24 u
               d) 12 u
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