Which of the following oxides cannot be reduced by hydrogen?

Identify the incorrect statement.

What happens when concentrated $H_2SO_4$ reacts with sugar?

Observe the following reactions:
$I$. $CO_{(g)} + H_{2(g)} \xrightarrow{X} HCHO_{(g)}$
$II$. $CO_{(g)} + 3 H_{2(g)} \xrightarrow{Y} CH_{4(g)} + H_2O_{(g)}$
The catalysts $X$ and $Y$ in the above reactions are respectively:

Ortho-hydrogen and para-hydrogen resemble in which of the following properties?

Hydrogen will not reduce: