In the manufacture of hydrogen from water gas ($CO + H_2O$), which of the following is the correct statement?

Question

$CO$ is oxidized to $CO_2$ with steam in the presence of a catalyst, followed by absorption of $CO_2$ in alkali.

$CO$ and $H_2$ are separated based on the difference in their densities.

Hydrogen is isolated by diffusion.

$H_2$ is removed by occlusion with $Pd$.

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