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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
    On subjecting 10 mL mixture of \[{{N}_{2}}\] and CO to repeated electro spark, 7 mL of \[{{O}_{2}}\] was required for combustion. What was the mole percent of CO in the mixture? (All volumes were measured under identical conditions)

    A) 60    

    B) 40    

    C) 6                                 

    D) 4

    Correct Answer: A

    Solution :

    [a] \[\underset{a}{\mathop{{{N}_{2}}}}\,+\underset{a}{\mathop{{{O}_{2}}}}\,\to \underset{2a}{\mathop{2NO}}\,\]
    \[CO+\frac{1}{2}{{O}_{2}}\to C{{O}_{2}}\]
    \[\left( 10-a \right)\text{ }\frac{(10-a)}{2}\,\,~\left( 10-a \right)\]
    \[a+\frac{(10-a)}{2}=7\]
    \[\therefore \text{ }a=4\]
    volume of CO = 6 mL
    Mole % of \[CO=~\frac{6\times 100}{10}~=60\]


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