Select wrong statements about alkali metals:

Options

A. All form `(MNH)_(2)` amide.
B. All form superoxides `(MO_(2))`
C. All form ionic hydrides (MH)
D. All form nitrides

Explanation

To solve the question of selecting the wrong statements about alkali metals, we will analyze each statement provided in the question.

### Step-by-Step Solution:

1. **Understanding Alkali Metals**:
- Alkali metals belong to Group 1 of the periodic table. They have one electron in their outermost shell (valence shell), which gives them a valency of +1. Their general electronic configuration is ns¹, where 'n' represents the principal quantum number.

2. **Analyzing the Statements**:
- **Statement A**: "All form MnH2 amide."
- This statement is true. Alkali metals can form amides, and they typically form the amide compounds like LiNH2, NaNH2, etc.

- **Statement B**: "All form superoxide, MO2."
- This statement is false. Only potassium (K), rubidium (Rb), and cesium (Cs) form superoxides (MO2). Sodium (Na) does not form superoxide. Therefore, this statement is incorrect.

- **Statement C**: "All form ionic hydrides."
- This statement is true. Alkali metals form ionic hydrides such as NaH, KH, etc. Therefore, this statement is correct.

- **Statement D**: "All form nitrides."
- This statement is false. Only lithium (Li) forms nitrides among the alkali metals. Other alkali metals do not form stable nitrides. Thus, this statement is also incorrect.

3. **Conclusion**:
- The wrong statements about alkali metals are **Statement B** and **Statement D**.

### Final Answer:
The wrong statements about alkali metals are:
- Statement B: "All form superoxide, MO2."
- Statement D: "All form nitrides."