JEE Main & Advanced Sample Paper JEE Main Sample Paper-45

  • question_answer
    The surface tension of several alcohols at \[20{}^\circ C\] is \[\gamma (C{{H}_{3}}OH)=22.61dyne\,\,c{{m}^{-1}},\]\[\gamma ({{C}_{2}}{{H}_{5}}OH)=2.275\times {{10}^{-2}}N{{m}^{-1}}\] and \[\gamma ({{C}_{3}}{{H}_{7}}OH)=23.78\,\,J{{m}^{-2}}\]. The alcohol having the highest surface tension is

    A)  \[C{{H}_{3}}OH\]              

    B)  \[{{C}_{2}}{{H}_{5}}OH\]

    C)  \[{{C}_{3}}{{H}_{7}}OH\]                      

    D)  All are same

    Correct Answer: C

    Solution :

     \[\because \]    \[1\,N={{10}^{5}}\,\,\text{dyne}\] and       \[1\,J=1\,\,Nm\] \[\therefore \] \[{{C}_{3}}{{H}_{7}}OH\] will have the highest surface tension.

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