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Q.3       a) What are cations?                                                     3       Av/R
                     b)  Write the symbols for the following ions
                     i) Magnesium ion
                     ii) Aluminium ion
           Q.4       What are anions? Give two examples                                       3       Av/R


           Q.5       a) What are polyatomic ions? Give two examples.                          5       Av/A
                     b) Write two differences between cations and anions.
































































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