Select the incorrect statements :

Options

A. Size of `H^(-)` is larger than `F^(-)`
B. Rb is more electropositive compared to Ca
C. `Na^(+)` is more electronegative than the Na
D. `Cl^(-)` is more electronegative than that of F

Answer

To solve the question of selecting the incorrect statement among the given options, we will analyze each statement one by one based on our knowledge of periodic trends and properties of ions.

### Step-by-step Solution:

1. **Analyzing the First Statement:**
- **Statement:** The size of the hydride ion (H⁻) is larger than the fluoride ion (F⁻).
- **Analysis:** The hydride ion has a radius of about 76 picometers, while the fluoride ion has a radius of about 71 picometers. This is because the hydride ion has fewer protons in its nucleus, resulting in less effective nuclear charge and a larger size.
- **Conclusion:** This statement is **correct**.

2. **Analyzing the Second Statement:**
- **Statement:** Rubidium (Rb) is more electropositive than calcium (Ca).
- **Analysis:** Electropositivity generally increases down a group in the periodic table. However, calcium is located above rubidium in the periodic table. Therefore, calcium is more electropositive than rubidium.
- **Conclusion:** This statement is **incorrect**.

3. **Analyzing the Third Statement:**
- **Statement:** Sodium ion (Na⁺) is more electronegative than sodium (Na).
- **Analysis:** Electronegativity is the tendency of an atom to attract electrons. A sodium ion (Na⁺) has lost an electron and thus has a positive charge, making it less electronegative compared to neutral sodium.
- **Conclusion:** This statement is **correct**.

4. **Analyzing the Fourth Statement:**
- **Statement:** Chloride ion (Cl⁻) is more electronegative than fluoride ion (F⁻).
- **Analysis:** Chlorine is less electronegative than fluorine in their neutral states. However, when considering their ionic forms, Cl⁻ does have a noble gas configuration, which can influence its electronegativity. However, generally, F⁻ is considered more electronegative than Cl⁻.
- **Conclusion:** This statement is **incorrect**.

### Final Conclusion:
The incorrect statements are:
- Rubidium is more electropositive than calcium (Statement 2).
- Chloride ion is more electronegative than fluoride ion (Statement 4).