Question

Which of the following oxides cannot react with an excess of $NaOH$?

• A. $BeO$
• B. $A{l}_2{O}_3$
• C. $Pb{O}_2$
• D. $CaO$

Answer 1

The correct option is D $CaO$

Since $NaOH$ is a base it can react with either an acidic oxide or an amphoteric oxide. $CaO$ is a basic oxide while all the other oxides in the given options are amphoteric.