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For a binary nonideal $A-B$ mixture exhibiting a minimum boiling azeotrope, the activity coefficients, $\gamma_{i} \left ( i=A, B \right )$, must satisfy

  1. $\gamma _{A}> 1,\gamma _{B}> 1$
  2. $\gamma _{A}< 1,\gamma _{B}> 1$
  3. $\gamma _{A}= 1,\gamma _{B}= 1$
  4. $\gamma _{A}< 1,\gamma _{B}< 1$
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