A minute of cupric salt is heated on borax bead in reducing flame of bunsen burner, the colour of bead after cooling will be

Options

A. Blue
B. Red
C. Colourless
D. Green

Explanation

To solve the question regarding the color of the borax bead after heating a minute of cupric salt in a reducing flame, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Experiment**:
- We are heating a minute of cupric salt (copper(II) salt) on a borax bead in a reducing flame.

2. **Identifying the Flame Type**:
- A reducing flame is characterized by an excess of fuel (like methane) and a limited supply of oxygen. This type of flame is important for the reduction reactions that can occur with metal ions.

3. **Behavior of Copper Salts**:
- Copper salts, when heated in a reducing flame, undergo a reduction reaction. This means that the copper ions (Cu²⁺) in the cupric salt will be reduced to elemental copper (Cu).

4. **Formation of the Borax Bead**:
- The borax bead serves as a medium to observe the color change. When the cupric salt is heated, it interacts with the borax, leading to the formation of a colored bead.

5. **Color of the Bead**:
- In a reducing flame, the copper ions are reduced to metallic copper, which imparts a characteristic red color to the borax bead.

6. **Conclusion**:
- After cooling, the color of the borax bead will be red due to the presence of reduced copper.

### Final Answer:
The color of the bead after cooling will be **red**.

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