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AMU Medical AMU Solved Paper-2015

  • question_answer
    The composition of a sample of website is\[F{{e}_{0.95}}{{O}_{1.00}}\]. What percentage of iron is present in the form of Fe (III)?

    A)  16.05                   

    B)  15.05

    C)  18.05                   

    D)  17.05

    Correct Answer: B

    Solution :

                    Oxidation number of Fe in wustite is \[=\frac{200}{93}=2.150\] It is an intermediate value in between two oxidation states of Fe, i.e. Fe (II) and Fe (III). Suppose that the percentage of Fe (III) be x, then                                 \[2\times (100-x)+3\times x=2.15\times 100\] or            \[200-2x+3x=215\] or            \[x=15%\] So, wustite is mixture of 15% Fe (III) and 85% Fe (II).


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