How does carbon monoxide,emitted by automobiles,prevent the transport of oxygen in the body tissues?

How many oxygen molecules can one hemoglobin molecule carry?

In lungs,in order to facilitate the removal of $CO_2$ from the blood,there is an exchange of ions between $RBC$ and the plasma which involves the movement of:

Although much carbon dioxide is carried in blood,yet blood does not become acidic because

In which form is $CO_2$ mostly carried by blood?

Blood is a medium to transport $O_{2}$ and $CO_{2}$. About ...$A$... per cent of $O_{2}$ is transported by ...$B$... in the blood and the remaining ...$C$... per cent of $O_{2}$ is carried in a dissolved state through the ...$D$...
Select the right options for $A, B, C$ and $D$ to complete the given statement.