Given below are two reactions, involved in the commercial production of dihydrogen
$$\begin{gathered} {\mathrm{C}}_{\left(\mathrm{s}\right)}+{\mathrm{H}}_2{\mathrm{O}}_{\left(\mathrm{g}\right)}\stackrel{{\mathrm{T}}_1}{⟶}{\mathrm{CO}}_{\left(\mathrm{g}\right)}+{\mathrm{H}}_{2\left(\mathrm{g}\right)} \\ {\mathrm{CO}}_{\left(\mathrm{s}\right)}+{\mathrm{H}}_2{\mathrm{O}}_{\left(\mathrm{g}\right)}\underset{\text{ Catalyst }}{\overset{{\mathrm{T}}_2}{\to }}{\mathrm{CO}}_{2\left(\mathrm{g}\right)}+{\mathrm{H}}_{2\left(\mathrm{g}\right)} \end{gathered}$$      
The temperatures T₁ and T₂ are correctly related as