Which of the following forms a stable compound with hemoglobin?

The chloride shift is observed for the movement of which of the following ions?

Choose the incorrect sentence from the following.

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.

What is the percentage of $O_2$ transported in dissolved form through the plasma?

Approximately what amount of $O_{2}$ reaches the tissues via $100 \ ml$ of blood (in $ml$)?