Philosopher's wool when heated with `BaO` at `100^(@)C` gives the compounds:

Options

A. `BaCdO_(2)`
B. `Ba+ZnO_(2)`
C. `BaO_(2)+Zn`
D. `BaZnO_(2)`

Answer

To solve the question regarding what compounds are formed when philosopher's wool (zinc oxide) is heated with barium oxide at 100°C, we can follow these steps:

### Step-by-Step Solution:

1. **Identify Philosopher's Wool**:
- Philosopher's wool is commonly known as zinc oxide (ZnO).

2. **Identify the Other Reactant**:
- The other reactant mentioned in the question is barium oxide (BaO).

3. **Understand the Reaction**:
- When zinc oxide (ZnO) is heated with barium oxide (BaO), they react to form a compound.

4. **Write the Reaction**:
- The chemical reaction can be represented as:
\[ \text{ZnO} + \text{BaO} \rightarrow \text{BaZnO}_2 \]
- This indicates that zinc oxide reacts with barium oxide to form barium zincate (BaZnO₂).

5. **Identify the Product**:
- The product formed from this reaction is barium zincate, which is represented as BaZnO₂.

6. **Select the Correct Option**:
- Based on the above reaction, the correct answer to the question is option 4, which corresponds to barium zincate (BaZnO₂).

### Final Answer:
The compound formed when philosopher's wool (ZnO) is heated with barium oxide (BaO) at 100°C is **barium zincate (BaZnO₂)**.

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