X, Y and Z are elements of the same period in the periodic table. 'X' forms an acidic oxide, 'Y' forms a basic oxide and 'Z' forms an amphoteric oxide. Which of the following represents the correct order of increasing atomic numbers?

Options

A. X, Y, Z
B. X, Z, Y
C. Y, X, Z
D. Y, Z, X

Answer

To solve the question, we need to identify the elements X, Y, and Z based on the types of oxides they form and their positions in the periodic table.

### Step-by-Step Solution:

1. **Identify the Types of Oxides:**
- **X forms an acidic oxide:** Acidic oxides are typically formed by non-metals. Common examples include oxides of sulfur (SO2, SO3), phosphorus (P2O5), and carbon (CO2).
- **Y forms a basic oxide:** Basic oxides are generally formed by metals, especially those in the first two groups of the periodic table. Examples include sodium oxide (Na2O) and magnesium oxide (MgO).
- **Z forms an amphoteric oxide:** Amphoteric oxides can react with both acids and bases. Common examples include aluminum oxide (Al2O3) and zinc oxide (ZnO).

2. **Determine the Position of Elements in the Periodic Table:**
- Since X is a non-metal forming an acidic oxide, it is likely to be found towards the right side of the period.
- Y, being a metal that forms a basic oxide, is likely to be found on the left side of the period.
- Z, which forms an amphoteric oxide, is usually a metalloid or a post-transition metal and is positioned between metals and non-metals.

3. **Establish the Order of Elements:**
- Based on the above characteristics, we can deduce that:
- Y (basic oxide) has the lowest atomic number (metal).
- Z (amphoteric oxide) has a higher atomic number than Y but lower than X.
- X (acidic oxide) has the highest atomic number (non-metal).
- Therefore, the correct order of increasing atomic numbers is: Y < Z < X.

4. **Conclusion:**
- The correct order of increasing atomic numbers for elements X, Y, and Z is Y, Z, X.

### Final Answer:
The correct order of increasing atomic numbers is: **Y < Z < X**.