Select the incorrect statements among the following. 

Options

A. In `d_(x^2 - y^2)` orbital, two nodal planes are present in xz- and yz-plane.
B. `d_(xy)` and `d_(x^2 - y^2)`have one common nodal plane.
C. One 4d orbital contains only two electrons of the same spin.
D. One 3d orbital contains a total of 10 electrons.

Answer

To solve the question of identifying the incorrect statements regarding atomic orbitals, we will analyze each statement one by one.

### Step-by-Step Solution:

1. **Statement 1: In the dx² - y² orbital, two nodal planes are present in the xz and yz planes.**
- The dx² - y² orbital has two nodal planes. These nodal planes are indeed present in the xz and yz planes. Therefore, this statement is **correct**.

2. **Statement 2: dxy and dx²y² have one common nodal plane.**
- The dxy orbital has nodal planes along the xz and yz planes. The dx² - y² orbital has nodal planes along the x = y and x = -y directions. Thus, dxy and dx² - y² do not share a common nodal plane. Therefore, this statement is **incorrect**.

3. **Statement 3: One 4D orbital contains only two electrons of the same spin.**
- According to the Pauli Exclusion Principle, no two electrons in the same orbital can have the same set of quantum numbers, including spin. Therefore, a 4D orbital cannot contain two electrons of the same spin. This statement is **incorrect**.

4. **Statement 4: One 3D orbital contains 10 electrons.**
- Each orbital can hold a maximum of 2 electrons (with opposite spins). In the d subshell (3D), there are 5 orbitals, which can collectively hold a maximum of 10 electrons. However, the statement implies a single 3D orbital contains 10 electrons, which is not possible. This statement is also **incorrect**.

### Summary of Incorrect Statements:
- The incorrect statements are **2, 3, and 4**.