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VMMC VMMC Medical Solved Paper-2014

  • question_answer
    In an auto engine with no pollution controls, about 5% of the fuel \[({{C}_{8}}{{H}_{18}})\] is un burnt. Molar ratio of CO and \[{{C}_{8}}{{H}_{18}}\] emitted in the exhaust gas is

    A) 100                        

    B) 152    

    C) 50                          

    D)  5

    Correct Answer: B

    Solution :

    \[\underset{\begin{smallmatrix}  1\,mol \\  0.95\,mol \end{smallmatrix}}{\mathop{{{C}_{8}}{{H}_{18}}}}\,+8.5{{O}_{2}}\xrightarrow[{}]{{}}\underset{\begin{smallmatrix}  8\,mol \\  7.6mol \end{smallmatrix}}{\mathop{8CO}}\,+9{{H}_{2}}O\] Emitted gas contains 0.05 mol \[{{C}_{8}}{{H}_{18}}\] and 7.6 mol of CO, if 1 mol of \[{{C}_{8}}{{H}_{18}}\] is the fuel. \[\frac{CO}{{{C}_{8}}{{H}_{18}}}=\frac{7.6}{0.05}=152.\]


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