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AFMC AFMC Solved Paper-2010

  • question_answer
    In an experiment, 4 g of \[{{M}_{2}}{{O}_{x}}\]oxide was reduced to 2.8 g of the metal. If the atomic mass of the metal is \[56\,g\,mo{{l}^{-1}},\] the number of O atoms in the oxide is

    A)  1                                            

    B)  2

    C)  3                                            

    D)  4

    Correct Answer: C

    Solution :

                     Mass of oxygen in oxide \[=4-2.8\]                                \[=1.2\,g\] \[\text{Eq}\text{.wt}\text{.of}\,\text{metal =}\frac{\text{mass of metal}}{\text{mass of oxygen}}\text{  }\!\!\times\!\!\text{  8}\] \[=\frac{2.8}{1.2}\times 8\] \[=18.67\]                 \[\text{Valency of metal =}\frac{\text{atomic wt}\text{. of metal}}{\text{eq}\text{.wt}\text{.of metal}}\]                                                 \[=\frac{56}{18.67}\](give)                                                 \[=3\]                                   


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