Consider the reactions L. $\mathrm{CO}+3 \mathrm{H}_2 \stackrel{\mathrm{A}}{\longrightarrow}…
Consider the reactions
L. $\mathrm{CO}+3 \mathrm{H}_2 \stackrel{\mathrm{A}}{\longrightarrow} \mathrm{CH}_4+\mathrm{H}_2 \mathrm{O}$
II. $\mathrm{CO}+2 \mathrm{H}_2 \stackrel{\text { B }}{\longrightarrow} \mathrm{CH}_3 \mathrm{OH}$
III. $\mathrm{O}_2+2 \mathrm{H}_2 \stackrel{\mathrm{C}}{\longrightarrow} 2 \mathrm{H}_2 \mathrm{O}$
The catalysts $\mathrm{A}, \mathrm{B}, \mathrm{C}$ are respectively
Different catalysts result in different degrees of reduction. All these catalysts absorb hydrogen gas but due to different reactions conditions and activity of the catalysts, we get different products.
$\begin{aligned} & \mathrm{CO}+3 \mathrm{H}_2 \stackrel{\mathrm{Ni}}{\longrightarrow} \mathrm{CH}_4+\mathrm{H}_2 \mathrm{O} \\ & \mathrm{CO}+2 \mathrm{H}_2 \stackrel{\mathrm{ZnO}-\mathrm{Cr}_2 \mathrm{O}_3}{\longrightarrow} \mathrm{CH}_3 \mathrm{OH} \\ & \mathrm{O}_2+2 \mathrm{H}_2 \stackrel{\mathrm{Pt}}{\longrightarrow} 2 \mathrm{H}_2 \mathrm{O}\end{aligned}$