`As_(2)S_(3)` and `TiO_(2)` sol are examples of

Options

A. Negativity charges sols
B. Positively charged sols
C. Positively and negatively charged sols respectively
D. Negatively and positively charged sold respectively

Answer

To solve the question regarding the nature of the colloidal particles As₂S₃ (arsenic sulfide) and TiO₂ (titanium dioxide), we will analyze each substance to determine whether they are negatively or positively charged salts.

### Step-by-Step Solution:

1. **Identify the substances**:
- We have two substances: As₂S₃ (arsenic sulfide) and TiO₂ (titanium dioxide).

2. **Determine the charge of As₂S₃**:
- As₂S₃ is a metallic sulfide. In colloidal chemistry, metallic sulfides are typically negatively charged. Therefore, As₂S₃ is classified as a negatively charged salt.

3. **Determine the charge of TiO₂**:
- TiO₂ is a metallic oxide. Metallic oxides are generally positively charged in colloidal systems. Hence, TiO₂ is classified as a positively charged salt.

4. **Combine the findings**:
- Based on the analysis, we conclude that As₂S₃ is negatively charged and TiO₂ is positively charged.

5. **Select the correct option**:
- Now, we compare our findings with the provided options:
- A: Negatively charged salts (incorrect for TiO₂)
- B: Positively charged salts (incorrect for As₂S₃)
- C: Positively charged for TiO₂ and negatively charged for As₂S₃ (incorrectly labeled)
- D: Negatively charged for As₂S₃ and positively charged for TiO₂ (correct)

Thus, the correct answer is **D: negatively and positively charged salts respectively**.