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NEET AIPMT SOLVED PAPER 1998

  • question_answer
                    Haemoglobin contains 0.33% of iron by weight. The molecular weight of haemoglobin is approximately 67200. The number of iron atoms (at. wt. of Fe is 56) present in one molecule of haemoglobin are:

    A)                                                                                                                                                                                                                 1             

    B)                                            6             

    C)                                            4             

    D)                            2

    Correct Answer: C

    Solution :

                    \[\because \] 0.33% of iron by weight means 100 g haemoglobin has 0.33 g iron.                 100 g of haemoglobin contains iron = 0.33 g                 \[\therefore \] 67200 g of haemoglobin contains iron                 \[\frac{0.33\times 67200}{100}g\,=221.768\,g\,of\,iron\]                 Number of e atoms = \[\frac{221.768}{56}=3.96\,\approx \,4\]


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