The correct order of basic strength is

Options

A. `CI_(2)O_(7)ltSO_(2)ltP_(4)O_(10)`
B. `NO_(2)ltCIO_(2)ltCO_(2)`
C. `AI_(2)O_(3)ltCaOltMgO`
D. None of the above

Answer

To determine the correct order of basic strength for the given oxides, we need to analyze the acidic and basic properties of the oxides based on their positions in the periodic table. Here’s a step-by-step solution:

### Step 1: Identify the Oxides
We need to identify the oxides for which we are determining the basic strength. Let's assume the oxides are:
1. SiO2 (Silicon dioxide)
2. CO2 (Carbon dioxide)
3. SO3 (Sulfur trioxide)
4. N2O5 (Dinitrogen pentoxide)

### Step 2: Understand Acidic and Basic Properties
- Oxides can be classified as acidic, basic, or amphoteric based on their behavior with water and acids/bases.
- Generally, non-metal oxides (like CO2, SO3, and N2O5) are acidic, while metal oxides are basic.
- The basic strength of an oxide increases as we move from right to left across a period and decreases as we move down a group.

### Step 3: Analyze the Oxides
- **N2O5**: This is a non-metal oxide and is quite acidic.
- **SO3**: This is also a non-metal oxide and is acidic, but less so than N2O5.
- **CO2**: This is a non-metal oxide and is acidic, but less than SO3.
- **SiO2**: This is generally considered to be amphoteric and has a lower basic strength compared to the other oxides.

### Step 4: Determine the Order of Basic Strength
- Since SiO2 is amphoteric, it will have the lowest basic strength among the given oxides.
- Following that, CO2 will have a higher basic strength than SiO2.
- SO3 will have a higher basic strength than CO2.
- N2O5 will have the highest basic strength among these oxides.

### Step 5: Final Order
Thus, the order of basic strength from highest to lowest is:
1. N2O5 (highest)
2. SO3
3. CO2
4. SiO2 (lowest)

### Conclusion
The correct order of basic strength is: **N2O5 > SO3 > CO2 > SiO2**.

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