NEET Chemistry States of Matter / पदार्थ की अवस्थाएँ - गैस एवं द्रव Question Bank Self Evaluation Test - States of Matter

  • question_answer
    For real gases van der Waals equation is written as \[\left( p+\frac{a{{n}^{2}}}{{{V}^{2}}} \right)(V-nb)=nRT\] where 'a' and 'b' are van der Waals constants. Two sets of gases are: (I) \[{{O}_{2}},C{{O}_{2}},{{H}_{2}}\] and He (II) \[C{{H}_{4}},{{O}_{2}}\] and \[{{H}_{2}}\] The gases given in set-I in increasing order of 'b' and gases given in set-II in decreasing order of 'a' are arranged below. Select the correct order from the following:

    A) \[(I)\,He<{{H}_{2}}<C{{O}_{2}}<{{O}_{2}}\,(II)\,C{{H}_{4}}>{{H}_{2}}>{{O}_{2}}\]

    B) \[(I)\,{{O}_{2}}<He<{{H}_{2}}<C{{O}_{2}}(II)\,{{H}_{2}}>{{O}_{2}}>C{{H}_{4}}\,\]

    C) \[(I)\,He<{{H}_{2}}<{{O}_{2}}<C{{O}_{2}}(II)\,C{{H}_{4}}>{{O}_{2}}>{{H}_{2}}\]

    D) \[(I)\,{{H}_{2}}<{{O}_{2}}<He<C{{O}_{2}}(II)\,{{O}_{2}}>C{{H}_{4}}>{{H}_{2}}\]

    Correct Answer: C

    Solution :

    [c]
    • Molar mass \[\uparrow \], 'a' increases
    • size of molecule \[\uparrow \], 'b' increase
    b(L/mol) \[a(bar.\,{{L}^{2}}/mo{{l}^{2}})\]
    \[{{H}_{2}}\xrightarrow{{}}0.02661\] \[C{{H}_{4}}\xrightarrow{{}}2.25\]
    \[He\xrightarrow{{}}0.0237\] \[O{{  }_{2}}\xrightarrow{{}}1.36\]
    \[{{O}_{2}}\xrightarrow{{}}0.03183\]  \[{{H}_{2}}\xrightarrow{{}}0.244\]
    \[C{{O}_{2}}\xrightarrow{{}}0.04267\]  
     


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