The Haldane effect is caused by which of the following?

If $ppCO_2$ is high and pH is low,then it will result in:
$i$. increase in affinity of haemoglobin for $O_2$
$ii$. decrease in affinity of haemoglobin for $O_2$
$iii$. oxygen dissociation curve shifts to left
$iv$. causes release of $O_2$ for diffusion into tissue cells
$v$. $H^+$ and $HCO_3^-$ ions combine to form carbonic acid

The oxygen dissociation curve of hemoglobin is . . . . . . .

Which of the following forms a stable compound with hemoglobin?

Transport of $CO_{2}$ by the blood is primarily dependent upon

The dissociation curve of haemoglobin is: