The human blood is buffered by ____

NH₄OH + NH₄Cl

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NaOH + NaCl

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HCO₃^-+ CO₃^-2

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H₃PO₄ + NaH₂PO₄

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Solution

The correct option is C
HCO₃^-+ CO₃^-2

$H C O_{3}^{-}$ is weak acid and $C O_{3}^{2 -}$ is its conjugate base

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