Question

The oxide that dissolves in caustic potash (KOH) is ______.

Options

• ZnO

• CuO

Answer 1

The oxide that dissolves in caustic potash (KOH) is ZnO.

Explanation:

Zinc oxide is amphoteric, meaning it reacts with both acids and bases. When it reacts with KOH, it forms a soluble salt called potassium zincate. Copper oxide (CuO), on the other hand, is a basic oxide and does not dissolve in alkalis.