Which of the following is/are correct regarding oxidation state of elements in their compounds:

Options

A. All `d`-Block elements show multiple oxidation state.
B. All `p`-Block elements show multiple oxidation state.
C. All `s`-Block elements show single oxidation state.
D. Some of 18 group elements can show multiple oxidation state.

Explanation

To determine which statements regarding the oxidation states of elements in their compounds are correct, we will analyze each statement step by step.

### Step 1: Analyze the first statement
**Statement:** All D block elements show multiple oxidation states.
**Analysis:** This statement is incorrect. While many D block elements do exhibit multiple oxidation states, not all of them do. For example, Scandium (Sc) primarily shows a +3 oxidation state and does not exhibit multiple oxidation states.
**Conclusion:** This statement is **false**.

### Step 2: Analyze the second statement
**Statement:** All P block elements show multiple oxidation states.
**Analysis:** This statement is also incorrect. While many P block elements can show multiple oxidation states, some do not. For instance, Fluorine (F) only shows a -1 oxidation state and does not exhibit positive or zero oxidation states.
**Conclusion:** This statement is **false**.

### Step 3: Analyze the third statement
**Statement:** All S block elements show a single oxidation state.
**Analysis:** This statement is correct. S block elements consist of Group 1 (alkali metals) and Group 2 (alkaline earth metals). Group 1 elements always show a +1 oxidation state, while Group 2 elements always show a +2 oxidation state.
**Conclusion:** This statement is **true**.

### Step 4: Analyze the fourth statement
**Statement:** Some of the group elements show multiple oxidation states.
**Analysis:** This statement is correct. While noble gases typically show a zero oxidation state, certain elements like Xenon can exhibit multiple oxidation states in compounds (e.g., XeF6 shows +6 oxidation state, XeO3 shows +6 oxidation state, etc.).
**Conclusion:** This statement is **true**.

### Final Conclusion
Based on the analysis:
- The correct statements are:
- Statement 3: All S block elements show a single oxidation state (True).
- Statement 4: Some of the group elements show multiple oxidation states (True).

### Summary of Correct Statements
- **Correct Statements:** Statement 3 and Statement 4.