# The most important buffer in the blood consists of:(a)- $HCl\text{ and C}{{\text{l}}^{-}}$(b)- ${{H}_{2}}C{{O}_{3}}\text{ and HC}{{\text{O}}_{3}}^{-}$(c)- ${{H}_{2}}C{{O}_{3}}\text{ }and\text{ C}{{\text{l}}^{-}}$(d)- $HCl\text{ and HC}{{\text{O}}_{3}}^{-}$

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Hint:
Buffer solution is a solution in which a small amount of acid or base would change the pH of the solution. The buffer of the blood contains a bicarbonate ion. It also has carbon dioxide.

-The buffer action is due to the presence of carbonic acid (${{H}_{2}}C{{O}_{3}}$), bicarbonate ion ($\text{HC}{{\text{O}}_{3}}^{-}$), and carbon dioxide ($C{{O}_{2}}$) in the blood.
Hence, the correct answer is option (b)- ${{H}_{2}}C{{O}_{3}}\text{ and HC}{{\text{O}}_{3}}^{-}$.