Question

Which of the following is an example of a metal oxide?

• A. $HCl$
• B. $N{H}_{4}OH$
• C. $MgO$
• D. $H_{2}S{O}_4$

Answer 1

The correct option is C $MgO$

Metals react with oxygen to form metal oxides.
Here, $MgO$ is a metal oxide formed when magnesium (metal) is burned in air.
$H_{2}S{O}_4$ and $HCl$ are acids and $N{H}_{4}OH$ is a weak base.