CO is harmful to man because of

Options :
  1. It forms carbonic acid
  2. It generate excess of CO2
  3. it is carcinogenic
  4. It competes with O2 For Haemoglobin
Answer and Explanation :-

Answer: Option 4

Explanation:

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All these things are miracles. It is a miracle if you can find true friends, and it is a miracle if you have enough food to eat, and it is a miracle if you get to spend your days and evenings doing whatever it is you like to do.
-Lemony Snicket The Lump of Coal