Haemoglobin of the human blood forms a stable complex compound with which of the following gas leading to death?

If the concentration of $CO_2$ is higher,the oxygen dissociation curve will shift towards:

Chloride shift is essential for the transport of

Under a given concentration in blood,dissociation of oxyhaemoglobin will increase if

Name the enzymes $A$ and $B$ in the following equation:
$CO _2+ H _2 O \underset{B}{\stackrel{A}{\rightleftharpoons}} H _2 CO _3 \underset{B}{\stackrel{A}{\rightleftharpoons}} HCO _3^{-}+ H ^{+}$

$CO_2$ is carried by haemoglobin as carbamino haemoglobin. This binding of $CO_2$ with $Hb$ is related to the partial pressure of .........