Question

Given below is a diagram showing the placement of five different oxides. With respect to the given diagram answer the following questions:

1. Name the type of oxide represented in region X in the diagram.
2. Identify the oxide which has been incorrectly placed in the above diagram.
3. Name the oxide from the above diagram which will form an alkali when dissolved in water.

Answer 1

1. Region X represents amphoteric oxide. It shows properties of both acidic and basic oxides.
2. Copper oxide (CuO), since it is a metallic oxide and metallic oxides are basic in nature, is put in the group of acidic oxides.
3. Sodium oxide will form an alkali when dissolved in water because it is water-soluble.
   \[\ce{\underset{(Sodium oxide)}{Na2O}+ H2O -> \underset{Sodium hydroxide}{2NaOH}}\]