Sum of total number of amphoteric and neutral oxides among the folllowing is :
`CO, NO, Al_(2)O_(3), PbO_(2), CaO, SnO_(2), ZnO`

Answer

To solve the question, we need to identify the amphoteric and neutral oxides among the given compounds: CO, NO, Al₂O₃, PbO₂, CaO, SnO₂, and ZnO.

### Step-by-Step Solution:

1. **Identify Neutral Oxides:**
- Neutral oxides are those that do not exhibit acidic or basic properties.
- From the list, CO (carbon monoxide) and NO (nitric oxide) are known to be neutral oxides.

2. **Identify Amphoteric Oxides:**
- Amphoteric oxides can react with both acids and bases.
- From the list, Al₂O₃ (aluminum oxide), SnO₂ (tin(IV) oxide), and ZnO (zinc oxide) are amphoteric oxides.
- PbO₂ (lead(IV) oxide) can also exhibit amphoteric behavior depending on the conditions, but it is primarily considered acidic.

3. **Identify Basic Oxides:**
- Basic oxides are typically metal oxides that react with acids.
- CaO (calcium oxide) is a basic oxide.

4. **Count the Oxides:**
- Neutral oxides: 2 (CO, NO)
- Amphoteric oxides: 4 (Al₂O₃, SnO₂, ZnO, and considering PbO₂ as amphoteric)
- Basic oxides: 1 (CaO)

5. **Calculate the Total:**
- Total number of amphoteric and neutral oxides = Number of neutral oxides + Number of amphoteric oxides
- Total = 2 (neutral) + 4 (amphoteric) = 6

### Final Answer:
The sum of the total number of amphoteric and neutral oxides among the given compounds is **6**.