In Bosch’s process which gas is utilized for the production of hydrogen.

Bosch process is manufacture of H₂ in commercial scale. H₂ is prepared from water gas
${\mathrm{C}}_{\left(\mathrm{S}\right)}+{\mathrm{H}}_2\mathrm{O}\stackrel{\mathrm{Ni}/{1000}^{\circ }\mathrm{c}}{\to }\mathrm{CO}+{\mathrm{H}}_2,\mathrm{\Delta H}=-121.3\mathrm{kJ}$
$\underset{\text{watergas }}{\underbrace{\mathrm{CO}+{\mathrm{H}}_2}}+{\mathrm{H}}_2{\mathrm{O}}_{\left(\mathrm{vap}\right)}\frac{\text{ catalyst }/\mathrm{\Delta }}{{500}^{\circ }\mathrm{C}\left({\mathrm{Fe}}_2{\mathrm{O}}_3/{\mathrm{Cr}}_2{\mathrm{O}}_3\right)}{\mathrm{CO}}_2+2{\mathrm{H}}_2\uparrow$