The basic strength of the oxides follows the order

Options

A. `Al_2O_3 gt MgO lt Na_2O`
B. `Al_2 O_3 lt MgO lt Na_2O`
C. `Na_2O_3 lt MgO gt Al_3O_2`
D. `Al _2 O_3 gt MgO gt Na_2O`

Answer

To determine the order of basic strength of the oxides, we need to analyze the metallic character of the elements involved in the oxides. The basic strength of oxides is influenced by the metallic character of the elements forming them. Here’s a step-by-step solution:

### Step 1: Identify the Oxides
We are given three oxides:
1. Na2O (Sodium Oxide)
2. MgO (Magnesium Oxide)
3. Al2O3 (Aluminium Oxide)

### Step 2: Understand Metallic Character
Metallic character refers to the tendency of an element to lose electrons and form positive ions. In the periodic table:
- Metallic character increases as you move down a group.
- Metallic character decreases as you move from left to right across a period.

### Step 3: Analyze the Position of Elements
- **Sodium (Na)**: Located in Group 1, Period 3.
- **Magnesium (Mg)**: Located in Group 2, Period 3.
- **Aluminium (Al)**: Located in Group 13, Period 3.

### Step 4: Determine the Metallic Character
- Sodium (Na) has the highest metallic character because it is in Group 1.
- Magnesium (Mg) has a lower metallic character than sodium but is still more metallic than aluminium.
- Aluminium (Al) has the least metallic character among the three since it is further to the right in the periodic table.

### Step 5: Relate Metallic Character to Basic Strength
Since the basic strength of oxides is directly proportional to the metallic character:
- Na2O will be the most basic because sodium has the highest metallic character.
- MgO will be less basic than Na2O but more basic than Al2O3.
- Al2O3 will be the least basic due to aluminium's lower metallic character.

### Step 6: Write the Order of Basic Strength
Based on the analysis, the order of basic strength of the oxides is:
**Na2O > MgO > Al2O3**

### Conclusion
Thus, the basic strength of the oxides follows the order:
**Na2O > MgO > Al2O3**