Name the alkali metals which form superoxides when heated in excess of air.

Explanation

To answer the question, "Name the alkali metals which form superoxides when heated in excess of air," we can follow these steps:

### Step-by-Step Solution:

1. **Identify Alkali Metals**:
The alkali metals include Lithium (Li), Sodium (Na), Potassium (K), Rubidium (Rb), and Cesium (Cs).

2. **Understand the Formation of Oxides**:
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