Which one of the following statements concerning the compounds of Lithium is false?

Options

A. The hydroxide, Carbonate, nitrate, decompose to give the oxide on heating
B. It is the most electronegative among alkali
C. The hydrogen carbonate cannot be isolated as a stable solid
D. It forms a peroxide but not superoxide

Answer

To determine which statement concerning the compounds of Lithium is false, we will analyze each option provided.

### Step-by-Step Solution:

1. **Analyze the first statement**: "Hydroxide, carbonate, nitrate decompose to give oxide on heating."
- Lithium compounds such as lithium hydroxide (LiOH), lithium carbonate (Li2CO3), and lithium nitrate (LiNO3) do decompose upon heating to form lithium oxide (Li2O). This statement is true.

2. **Analyze the second statement**: "It forms the most electronegative among alkali metals."
- Lithium is indeed the most electronegative element among the alkali metals (Li, Na, K, Rb, Cs). This is due to its small size and high effective nuclear charge. Therefore, this statement is also true.

3. **Analyze the third statement**: "The hydrogen carbonate cannot be isolated as a stable solid."
- Lithium hydrogen carbonate (LiHCO3) is indeed unstable and tends to decompose into carbon dioxide (CO2) and water (H2O) when isolated. This statement is true.

4. **Analyze the fourth statement**: "It forms peroxide but not superoxide."
- Lithium does not form peroxides or superoxides. It primarily forms lithium oxide (Li2O) when reacting with oxygen. The statement that it forms peroxide is incorrect. Therefore, this statement is false.

### Conclusion:
The false statement concerning the compounds of Lithium is: "It forms peroxide but not superoxide."