Which of the following metal will give apple green colour on Busen flame-

Options

A. `Ba`
B. `Sr`
C. `Ca`
D. K

Answer

To determine which metal gives an apple green color when heated in a Bunsen flame, we will analyze each option provided.

### Step-by-Step Solution:

1. **Identify the Metals**: We need to identify the metals from the options given. The common metals that are tested in a flame test include Barium (Ba), Strontium (Sr), Calcium (Ca), and Potassium (K).

2. **Understanding Flame Colors**: Each metal produces a characteristic color when burned in a flame:
- **Barium (Ba)**: Produces an apple green color in the Bunsen flame.
- **Strontium (Sr)**: Produces a crimson to scarlet color.
- **Calcium (Ca)**: Produces a brick red color.
- **Potassium (K)**: Produces a lilac or light purple color.

3. **Testing Each Metal**:
- **Barium**: When heated, it gives an apple green color, which is the color we are looking for.
- **Strontium**: Produces a crimson color, so it is not the correct answer.
- **Calcium**: Produces a brick red color, so it is also not the correct answer.
- **Potassium**: Produces a lilac color, which is not the desired apple green color.

4. **Conclusion**: Based on the flame test results, the metal that gives an apple green color in a Bunsen flame is **Barium (Ba)**.

### Final Answer:
The metal that gives an apple green color on a Bunsen flame is **Barium (Ba)**.