The correct order of acid strength is

Options

A. `Cl_(2)O_(7)gtSO_(3)gtP_(4)O_(10)`
B. `CO_(2)gtN_(2)O_(5)gtSO_(3)`
C. `Na_(2)OgtMgOgtAl_(2)O_(3)`
D. `K_(2)OgtCaOgtMgO`

Explanation

To determine the correct order of acid strength among the given oxides (Cl2O7, SO3, and P4O10), we need to analyze the oxidation states of the central atoms and their electronegativities. Here's a step-by-step solution:

### Step 1: Identify the Oxidation States
- For Cl2O7, the oxidation state of Cl is +7.
- For SO3, the oxidation state of S is +6.
- For P4O10, the oxidation state of P is +5.

### Step 2: Compare the Oxidation States
The strength of an acid generally increases with the oxidation state of the central atom. Higher oxidation states typically lead to stronger acids because they can stabilize the negative charge on the conjugate base more effectively.

### Step 3: Determine the Order Based on Oxidation States
From the oxidation states identified:
- Cl2O7 (+7) > SO3 (+6) > P4O10 (+5)

Thus, the order of acid strength based on oxidation states is:
**Cl2O7 > SO3 > P4O10**

### Step 4: Consider Electronegativity
While the oxidation state is a primary factor, electronegativity also plays a role. Chlorine (Cl) is more electronegative than sulfur (S) and phosphorus (P), which further supports the order derived from oxidation states.

### Final Conclusion
The correct order of acid strength among the given oxides is:
**Cl2O7 > SO3 > P4O10**

---