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                        Questions 20 – 22                &nb

                        Questions 20 – 22

                        Assume that the following reaction (1) is exothermic:

                 Fe3+(aq)     +    SCN-(aq)      ↔     FeSCN2+(aq)      +    heat released          

        20. Which of the following changes will shift the equilibrium to the left?                             [4]

         a) addition of Fe(NO3)3    b) Addition of potassium fluoride  c) cooling the solution  d) none

     

         21. Which of the following changes will shift the equilibrium to the right?                 [4]

         a) addition of KSCN   b) addition of potassium fluoride  c) heating the solution  d) none

         22. The color intensity of the reaction mixture at equilibrium is expected to be

               decreasing after addition of                                                                                  [4]                                               

         a) potassium oxalate           b) Fe(NO3)3              c) water                  d) KSCN   

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