Choose the incorrect statements from the following:

Options

A. Ionization energy of atom may be negative.
B. Ionization energy of an ion may be negative.
C. Ionization energy is inverscly proportional to radius.
D. Electron present in p orbital is in need of less energy for its removal as compared to electron present in d orbital having the same principal quantum number.

Answer

To solve the question of identifying the incorrect statements, we will analyze each statement regarding ionization energy and the behavior of electrons in orbitals.

### Step-by-Step Solution:

1. **Understanding Ionization Energy**:
- Ionization energy is defined as the energy required to remove an electron from an isolated gaseous atom.
- It is always a positive value because energy must be supplied to overcome the attraction between the nucleus and the electron.

2. **Evaluating the First Statement**:
- The first statement claims that the ionization energy of an atom may be negative.
- This is incorrect because ionization energy cannot be negative; it is always a positive quantity. Therefore, this statement is false.

3. **Understanding Electron Removal from Orbitals**:
- The next statement discusses the energy required to remove an electron from different orbitals (specifically T orbitals).
- It states that an electron present in a T orbital requires less energy for its removal compared to another electron in the same T orbital with the same principal quantum number.

4. **Evaluating the Second Statement**:
- This statement is also false. In general, electrons in the same subshell (like T orbitals) have similar energy levels, and the energy required to remove them does not significantly differ based solely on their position within the subshell.

5. **Conclusion**:
- Both statements analyzed are incorrect. The first statement about ionization energy being negative is false, and the second statement about the energy required for electron removal from T orbitals is also false.

### Final Answer:
- The incorrect statements are:
1. The ionization energy of an atom may be negative.
2. The electron present in T orbital is in need of less energy for its removal as compared to the electron present in the T orbital having the same principal quantum number.