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AMU Medical AMU Solved Paper-2003

  • question_answer
    A gas is found to have formula \[{{(CO)}_{n}}\]. If its vapour density is 56, the value of n will be

    A)  7                                            

    B)  5

    C)  4                                            

    D)  3

    Correct Answer: C

    Solution :

                     Key Idea             Molecular mass                                 = 2 \[\times \] vapour density Molecular mass = n \[\times \] empirical mass Here,     Vapour density = 56 \[\therefore \]  Molecular mass \[=2\times 56=112\] Empirical mass of \[{{(CO)}_{n}}=(1\times 12+1\times 16)\]                                 = 28                 \[n=\frac{molecular\text{ }mass}{empirical\text{ }mass}=\frac{112}{28}\]


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