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

In which of the following is carbonic anhydrase primarily active?

Which of the following has the highest affinity for hemoglobin?

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

What is the amount of oxygen carried by $1 \, g$ of hemoglobin?

............$\%$ of $O_2$ is transported through the plasma in a dissolved state,nearly ...........$\%$ of $CO_2$ is transported by $RBCs,$ and ...................$\%$ of $CO_2$ is carried as bicarbonate.