Multiple choice

In which form is iron present in haemglobin

  1. Ionic

  2. unionic

  3. Fe2+

  4. Fe3+
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Iron in haemoglobin is in the ferrous state (Fe2+), which allows oxygen binding. The Fe3+ (ferric) state found in methemoglobin cannot bind oxygen. The ionic/unionic terminology is not standard; Fe2+ is the correct notation.

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