Question
In context with the industrial preparation of hydrogen from water gas $$\left( {CO + {H_2}} \right),$$ which of the following is the correct statement ?
A.
$$CO$$ and $${H_2},$$ are fractionally separated using differences in their densities
B.
$$CO$$ is removed by absorption in aqueous $$C{u_2}C{l_2}$$ solution
C.
$${H_2}$$ is removed through occlusion with $$Pd$$
D.
$$CO$$ is oxidised to $$C{O_2}$$ with steam in the presence of a catalyst followed by absorption of $$C{O_2}$$ in alkali
Answer :
$$CO$$ is oxidised to $$C{O_2}$$ with steam in the presence of a catalyst followed by absorption of $$C{O_2}$$ in alkali
Solution :
On the industrial scale hydrogen is prepared from water gas according to following
reaction sequence
\[\underbrace{CO+{{H}_{2}}}_{\text{water gas}}+\underbrace{{{H}_{2}}O}_{\text{(steam)}}\xrightarrow{\text{catalyst}}\] \[C{{O}_{2}}+2{{H}_{2}}\xrightarrow[\text{(alkali)}]{2\,NaOH}N{{a}_{2}}C{{O}_{3}}+{{H}_{2}}O\]
From the above it is clear that $$CO$$ is first oxidised to $$C{O_2}$$ which is then absorbed in $$NaOH.$$