Change of catalyst changed products
$$\begin{gathered} \mathrm{CO}+3{\mathrm{H}}_2\stackrel{\mathrm{Ni}}{⟶}\mathrm{X}+{\mathrm{H}}_2\mathrm{O} \\ \mathrm{CO}+2{\mathrm{H}}_2\stackrel{ }{\underset{{\mathrm{Cr}}_{2_{ }}{\mathrm{O}}_3}{\overset{{\mathrm{Cu}}_2/\mathrm{ZnO}}{\to }}}\mathrm{Y} \\ \mathrm{CO}+{\mathrm{H}}_2\stackrel{\mathrm{Cu}}{⟶}\mathrm{Z} \end{gathered}$$
The magnitude of the algebraic sum of the oxidation state of carbon in X, Y and Z is