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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
    A mixture of \[{{O}_{2}}\] and gas "Y" mol. mass 80 in the mole ratio a : b has a mean molecular mass 40. What would be mean molecular mass, if the gases are mixed in the ratio b : a under, identical conditions? (Assume that gases are non-reacting):    

    A) 40                    

    B) 48   

    C) 62                                

    D) 72

    Correct Answer: D

    Solution :

    [d] Let mole fraction of \[{{O}_{2}}\] is \[x\] \[40=32\times x+80\left( 1-x \right)\] or \[x=5/6\] \[a:b=x:\left( 1-x \right)=\frac{5}{6}:\frac{1}{6}\] When ratio is changed \[{{M}_{mixture}}=32\times \frac{1}{60}+80\times \frac{5}{6}=72\]


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