Which of the following oxides is not expected to react with sodium hydroxide? [CBSE AIPMT 2009]
CaO
Sodium hydroxide, NaOH, being a strong alkali never react with a basic oxide (compound). Among the given options, B2O3 and BeO are amphoteric oxides, SiO2 is an acidic oxide and CaO is a basic oxide. Therefore, NaOH does not react with CaO.