Which of the following statements are correct?
I. Oxides of group 2 elements are acidic in nature.
II. Dioxide of the element which belongs to group 16 and 3rd period is basic in nature.
III. Oxide of element having electronic configuration 2, 4 is acidic in nature.
IV. Element having atomic number 19 forms basic oxide.

Options

A. I and III only
B. II and IV only
C. III and IV only
D. I, II, III and IV

Explanation

To determine which of the statements are correct, let's analyze each one step by step:

### Step 1: Analyze Statement I
**Statement I**: Oxides of group 2 elements are acidic in nature.

- Group 2 elements are known as alkaline earth metals (e.g., Be, Mg, Ca, Sr, Ba).
- The oxides of these metals (such as MgO, CaO) are generally basic in nature, not acidic.
- **Conclusion**: This statement is **incorrect**.

### Step 2: Analyze Statement II
**Statement II**: Dioxide of the element which belongs to group 16 and 3rd period is basic in nature.

- The element in group 16 and 3rd period is sulfur (S).
- The dioxide of sulfur is sulfur dioxide (SO₂), which is acidic in nature, not basic.
- **Conclusion**: This statement is **incorrect**.

### Step 3: Analyze Statement III
**Statement III**: Oxide of element having electronic configuration 2, 4 is acidic in nature.

- The electronic configuration 2, 4 corresponds to the element silicon (Si).
- The oxide of silicon is silicon dioxide (SiO₂), which is indeed acidic.
- **Conclusion**: This statement is **correct**.

### Step 4: Analyze Statement IV
**Statement IV**: Element having atomic number 19 forms a basic oxide.

- The element with atomic number 19 is potassium (K).
- The oxide of potassium is potassium oxide (K₂O), which is basic in nature.
- **Conclusion**: This statement is **correct**.

### Final Summary of Statements
- **Statement I**: Incorrect
- **Statement II**: Incorrect
- **Statement III**: Correct
- **Statement IV**: Correct

### Correct Statements
The correct statements are **III and IV**.

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