Choose the wrong statement.

Reduction in $pH$ of blood will

Oxygen is transported by

Haemoglobin $(Hb)$ is a

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 quantity of $CO_2$ transported in the form of bicarbonates by blood (including both plasma and $RBC$) (in $\%$)?