Alkali metals oxide are obtained by combustion of the metals.Although Na normally gives `Na_2O_2`,it will take up further oxygen at elevated pressure and temperature to form `NaO_2`.The per and superoxides of the heavier alkalies can also be prepared by passing stoichiometric amounts of oxygen into their solution in liquid ammonia.
The different alkali metal oxides can be distinguished by reaction with water.The superoxides reacts with `CO_2` and give oxygen gas.The stability of per and superoxides is based upon that larger cation can stablise larger anion, due to larger lattice energy.
Alkali metals dissolve in liquid ammonia.Dilute solutions are dark blue in colour but as the concentration increases above 3M, the colour changes to copper bronze and the solution acquires the metallic lusture due to the formation of metal ions clusters.The solutions of alkali metals in liquid ammonia are good conductors of electricity due to the presence of ammoniated cations and ammoniated electrons.However, the conductivity decreases as the concentrations increases, since ammoniated electrons and ammoniated cation associate.
Select the correct choice for alkali metal oxides.

Options

A. Metal oxides react with water forming only metal hydroxides
B. Metal peroxides react with hot water forming metal hydroxides and oxygen gas
C. Metal superoxides react with water forming metal hydroxides , hydrogen peroxide and `O_2` gas
D. All of these

Explanation

To solve the question regarding alkali metal oxides and their reactions, we will analyze the statements provided and determine their correctness based on the information given in the paragraph.

### Step-by-Step Solution:

1. **Understanding Alkali Metal Oxides**:
- Alkali metals (Group 1 metals) react with oxygen to form oxides, peroxides, and superoxides.
- Sodium typically forms sodium peroxide (Na2O2) but can form sodium oxide (NaO2) under certain conditions.

2. **Reactions with Water**:
- The first statement claims that metal oxides react with water to form only metal hydroxides.
- This is correct as the general reaction for alkali metal oxides (MO) with water (H2O) is:
\[ \text{MO} + \text{H}_2\text{O} \rightarrow 2\text{MOH} \]
- Thus, the first statement is true.

3. **Reactions of Peroxides with Water**:
- The second statement mentions that metal peroxides react with hot water to form metal hydroxides and oxygen gas.
- The reaction for metal peroxides (M2O2) with water is:
\[ \text{M}_2\text{O}_2 + 2\text{H}_2\text{O} \rightarrow 2\text{MOH} + \frac{1}{2}\text{O}_2 \]
- This confirms that the second statement is also true.

4. **Reactions of Superoxides with Water**:
- The third statement states that metal superoxides react with water to form metal hydroxide, hydrogen peroxide, and oxygen gas.
- The reaction for metal superoxides (M2O2) with water is:
\[ 2\text{MO}_2 + 2\text{H}_2\text{O} \rightarrow 2\text{MOH} + \text{H}_2\text{O}_2 + \text{O}_2 \]
- This indicates that the third statement is also true.

5. **Conclusion**:
- Since all three statements are correct, the answer to the question is that all of these statements regarding alkali metal oxides are true.

### Final Answer:
All of the statements regarding alkali metal oxides are correct.

---