The molar mass of hemoglobin is about65000 g ${mol}^{- 1}$ . Every hemoglobin contains 4 iron atoms. Thus,

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iron content in hemoglobin is 0.35% by mass

1 mole of hemoglobin contains 56 g iron

1 mole of hemoglobin contains 224 g iron

if iron content is increased to 0.56%, molar mass of hemoglobin would be higher than 65000 g ${mol}^{- 1}$

answer is A, B, D.

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Detailed Solution

% of composition = $\frac{No . of Atoms \times at . Wt}{M . Wt} \times 100$

1 mole hemoglobin contain 4 gram atoms of iron mass of Fe in 1 mole Hemoglobin

= 4 × 56

= 224 grams

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