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JEE Main & Advanced Chemistry Some Basic Concepts of Chemistry / रसायन की कुछ मूलभूत अवधारणाएँ Question Bank Self Evaluation Test - Some Basic Concepts of Chemistry

  • question_answer
    An ideal gaseous mixture of ethane \[({{C}_{2}}{{H}_{5}})\] and ethene \[({{C}_{2}}{{H}_{4}})\] occupies 28 litre at 1 atm and 273 K. The mixture reacts completely with 128 g \[{{O}_{2}}\] to produce \[C{{O}_{2}}\] and \[{{H}_{2}}O\]. Mole fraction at \[{{C}_{2}}{{H}_{6}}\] in the mixture is: 

    A) 0.6    

    B) 0.4    

    C) 0.5                   

    D) 0.8

    Correct Answer: B

    Solution :

    [b] \[{{C}_{2}}{{H}_{6}}+3.5{{O}_{2}}\xrightarrow{{}}2C{{O}_{2}}+3{{H}_{2}}O;\]
    \[{{C}_{2}}{{H}_{4}}+3{{O}_{2}}\xrightarrow{{}}2C{{O}_{2}}+2{{H}_{2}}O\]
    Let volume of ethane is x litre, \[22.4\times 4=3.5x+3\left( 28-x \right)\]
    \[\Rightarrow x=11.2\] litre at constant T and P, \[V\propto n\]:
    \[\Rightarrow \] Mole fraction of \[{{C}_{2}}{{H}_{6}}\]in mixture \[=\frac{11.2}{28}=0.4\]


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