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      Question

      For each unit increase in pH the activity of

      Fe3+ decreases by:
      A 10 folds Correct Answer Incorrect Answer
      B 100 folds Correct Answer Incorrect Answer
      C 1000 folds Correct Answer Incorrect Answer
      D 50 folds Correct Answer Incorrect Answer
      E 200 folds Correct Answer Incorrect Answer

      Solution

      For each unit increase in pH the activities of Fe3+ and Fe2+ decrease by 1000 fold and 100 fold respectively.

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