`ZnO+CoOundersetto(Delta)X`,Product `X` colour is:

Options

A. Green
B. Blue
C. Pink
D. Bluish green

Answer

To solve the question regarding the color of the product formed when zinc oxide (ZnO) is mixed with cobalt oxide (CoO) and heated, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Reactants**:
- The reactants in this reaction are zinc oxide (ZnO) and cobalt oxide (CoO).

2. **Write the Reaction**:
- When ZnO and CoO are heated together, they undergo a reaction to form a compound. The reaction can be represented as:
\[ \text{ZnO} + \text{CoO} \xrightarrow{\Delta} \text{Zn}_2\text{Co}_2\text{O}_4 \]
- This compound is known as zinc cobalt oxide.

3. **Determine the Product**:
- The product formed from the reaction of ZnO and CoO is zinc cobalt oxide (Zn2Co2O4).

4. **Identify the Color of the Product**:
- The compound Zn2Co2O4 is known to be bright green in color.

5. **Conclusion**:
- Therefore, the color of the product X formed from the reaction of ZnO and CoO when heated is **green**.

### Final Answer:
The color of product X is **green**.