For Q83, the answer is C. Amphoteric oxide can react with both
acid and alkalis.
For Q59, my answer will be C.
First, I'll eliminate the acidic oxide which is the carbon
dioxide.
Then, I'll eliminate the amphoteric oxides which are the Aluminium
oxide and Zinc oxide. As you know, amphoteric oxides can react with
both acids and alkalines.
The remain answer left is C, Copper(II) oxide.
