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      Question

      The effectiveness of many chemical preservatives depends

      primarily on the food:
      A Temperature Correct Answer Incorrect Answer
      B pH Correct Answer Incorrect Answer
      C Water content Correct Answer Incorrect Answer
      D Acidity Correct Answer Incorrect Answer

      Solution

      Preservatives (e.g., benzoic acid) are pH-dependent. Benzoate is effective at pH <4.5 (undissociated form penetrates microbes). Water content/temperature are secondary factors. 

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