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BCECE Engineering BCECE Engineering Solved Paper-2007

  • question_answer
    A gas is found to have a formula \[{{[CO]}_{x}}.\]Its vapour density is 70, the \[x\] is

    A)  3.0                        

    B)         3.5                        

    C)  5.0                          

    D)  6.5

    Correct Answer: C

    Solution :

    Given vapour density = 70 \[\therefore \] molecular weight \[=2\,\,\times \]vapour density                                 \[=2\times 70=140\] \[{{[CO]}_{x}}={{(12+16)}_{x}}={{(28)}_{x}}\] \[\because \]     \[{{(28)}_{x}}=140\] \[x=\frac{140}{28}=5\]                 \[\therefore \] Formula is \[{{(CO)}_{5}}\]


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