Which is not incorrect for acidic strength ?

Options

A. `H_(2)SltH_(2)SeltH_(2)Te`
B. `HCIO_(4)gtHCIO_(3)gtHCIO`
C. `P_(4)O_(10)gtSiO_(2)`
D. All are correct

Answer

To determine which statement is not incorrect regarding acidic strength, we need to analyze the statements provided in the question.

### Step-by-Step Solution:

1. **Understanding Acidic Strength**:
Acidic strength refers to the ability of a substance to donate protons (H⁺ ions) in a solution. The stronger the acid, the more readily it donates protons.

2. **Analyzing the First Statement (H₂S, H₂Se, H₂Te)**:
- These compounds belong to Group 16 of the periodic table.
- As we move down the group from sulfur (S) to selenium (Se) to tellurium (Te), the size of the atoms increases.
- The overlap between the hydrogen's 1s orbital and the p orbitals of these elements becomes weaker as the size increases.
- Weaker overlap means that the H⁺ ion can break away more easily, leading to increased acidity.
- Therefore, the order of acidity is H₂Te > H₂Se > H₂S. This statement is correct.

3. **Analyzing the Second Statement (HClO₄, HClO₃, HClO)**:
- These are oxyacids of chlorine.
- The acidic strength of oxyacids generally increases with the number of oxygen atoms attached to the central atom (in this case, chlorine).
- HClO₄ has the most oxygen, followed by HClO₃, and then HClO, which has the least.
- Therefore, the order of acidity is HClO₄ > HClO₃ > HClO. This statement is also correct.

4. **Analyzing the Third Statement (P₄O₁₀ and SiO₂)**:
- P₄O₁₀ (phosphorus pentoxide) has a higher percentage of oxygen compared to SiO₂ (silicon dioxide).
- The logic follows that a higher percentage of oxygen typically correlates with stronger acidity.
- Since P₄O₁₀ has more oxygen per phosphorus atom than SiO₂ has per silicon atom, it is more acidic.
- Thus, the order of acidity is P₄O₁₀ > SiO₂. This statement is also correct.

5. **Conclusion**:
- All three statements regarding acidic strength are correct.
- Therefore, the answer to the question "Which is not incorrect for acidic strength?" is that all provided statements are correct.

### Final Answer:
All options (A, B, and C) are correct regarding acidic strength.