Which statement is incorrect for the d-block elements

Options

A. Have atomic radii larger than s and p-block elements
B. Have high melting points, boiling points an tensile strength
C. Have variable oxidation states
D. Exhibit catalytic activity

Answer

To determine which statement is incorrect for the d-block elements, we will analyze each option provided in the question.

### Step-by-Step Solution:

1. **Understanding d-block Elements**:
- The d-block elements are transition metals found in groups 3 to 12 of the periodic table. They are characterized by the presence of d electrons.

2. **Analyzing Option A**:
- **Statement**: "Having atomic radii larger than S and P block elements."
- **Analysis**:
- In the fourth period, for example, potassium (K) and calcium (Ca) are in the s-block, while scandium (Sc) is the first d-block element.
- As we move across the period from K to Sc, the atomic size decreases.
- In some cases, the atomic radii of d-block elements can be smaller than those of p-block elements in the same period.
- Therefore, this statement is incorrect.

3. **Analyzing Option B**:
- **Statement**: "Having high melting points, boiling points, and tensile strength."
- **Analysis**:
- This statement is generally true for d-block elements as they are metals, which typically have high melting and boiling points due to strong metallic bonding.

4. **Analyzing Option C**:
- **Statement**: "Variable oxidation states."
- **Analysis**:
- This is true as d-block elements can exhibit multiple oxidation states due to the involvement of d electrons in bonding.

5. **Analyzing Option D**:
- **Statement**: "Exhibit catalytic activity."
- **Analysis**:
- This statement is also true. Many d-block elements, such as platinum and palladium, are known for their catalytic properties.

6. **Conclusion**:
- The only incorrect statement among the options provided is Option A: "Having atomic radii larger than S and P block elements."

### Final Answer:
The incorrect statement for the d-block elements is: **A. Having atomic radii larger than S and P block elements.**

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