JEE Main & Advanced Chemistry Some Basic Concepts of Chemistry Question Bank Atomic Molecular and Equivalent masses

  • question_answer A 400 mg iron capsule contains 100 mg of ferrous fumarate, \[{{(CHCOO)}_{2}}Fe\]. The percentage of iron pasent in it is approximately

    A)                 33%       

    B)                 25%

    C)                 14%       

    D)                 8%

    Correct Answer: D

    Solution :

               Molecular weight of \[{{(CHCOO)}_{2}}Fe=170\]                    Fe present in 100mg of \[{{(CHCOO)}_{2}}Fe\]                    \[=\frac{56}{170}\times 100mg=32.9mg\]                    This is present in 400mg of capsule                                 % of Fe in capsule \[=\frac{32.9}{400}\times 100=8.2\].

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