On heating in excess of oxygen, lithium gives

Options

A. `Li_(2)O`
B. `LiO`
C. `Li_(2)O_(2)`
D. `LiO_(3)`

Explanation

To solve the question "On heating in excess of oxygen, lithium gives," we need to analyze the behavior of lithium when it reacts with oxygen.

### Step-by-Step Solution:

1. **Understanding the Reaction**: When lithium is heated in the presence of excess oxygen, it undergoes a chemical reaction. The primary product of this reaction needs to be identified.

2. **Identifying the Product**: Lithium reacts with oxygen to form lithium oxide (Li2O). This is a common reaction for alkali metals when they react with oxygen.

3. **Reason for Product Formation**: Lithium does not form peroxides (Li2O2) or superoxides (LiO2) like other alkali metals (e.g., sodium, potassium) because of its small ionic size. The small size of the lithium ion (Li+) makes it unable to stabilize the larger peroxide (O2^2-) and superoxide (O2^-) ions.

4. **Conclusion**: Therefore, the only product formed when lithium is heated in excess of oxygen is lithium oxide (Li2O).

### Final Answer:
On heating in excess of oxygen, lithium gives lithium oxide (Li2O).

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