The correct order of acidic character of oxides in third period of periodic table is

Options

A. `SiO_(2)ltP_(4)O_(10)ltSO_(3)ltCI_(2)O_(7)`
B. `Cl_(2)O_(7)ltSO_(3)ltP_(4)O_(10)ltSiO_(2)`
C. `SO_(3)ltCI_(2)O_(7)ltP_(4)O_(10)ltSiO_(2)`
D. `SiO_(2)ltCI_(2)O_(7)ltP_(4)O_(10)ltSO_(3)`

Explanation

To determine the correct order of acidic character of the oxides in the third period of the periodic table, we need to analyze the oxides mentioned: SiO2, P4O10, SO3, and Cl2O7.

### Step-by-Step Solution:

1. **Identify the Oxides**: The oxides we are considering from the third period are:
- SiO2 (Silicon Dioxide)
- P4O10 (Phosphorus Pentoxide)
- SO3 (Sulfur Trioxide)
- Cl2O7 (Dichlorine Heptoxide)

2. **Determine the Oxidation States**:
- In SiO2, silicon has an oxidation state of +4.
- In P4O10, phosphorus has an oxidation state of +5.
- In SO3, sulfur has an oxidation state of +6.
- In Cl2O7, chlorine has an oxidation state of +7.

3. **Understand the Relationship Between Oxidation State and Acidity**:
- Generally, as the oxidation state of a non-metal increases, the acidic character of its oxides also increases. This is because higher oxidation states typically lead to stronger acidic behavior.

4. **Consider Non-metallic Character**:
- Non-metallic character also plays a role in determining the acidic nature of oxides. As we move from left to right across the periodic table, non-metallic character increases. Therefore, oxides of more non-metallic elements tend to be more acidic.

5. **Rank the Acidity Based on Oxidation State and Non-metallic Character**:
- Cl2O7 (Cl has the highest oxidation state of +7 and is the most non-metallic) > SO3 (S has an oxidation state of +6) > P4O10 (P has an oxidation state of +5) > SiO2 (Si has an oxidation state of +4).

6. **Final Order of Acidity**:
- The correct order of acidic character of the oxides in the third period is:
- Cl2O7 > SO3 > P4O10 > SiO2

### Conclusion:
The correct order of acidic character of the oxides in the third period of the periodic table is Cl2O7 > SO3 > P4O10 > SiO2.