Which of the following substance are green ?

Options

A. `Fe(BO_(2))_(3)`
B. `Cu`
C. `Cr(BO_(2))_(3)`
D. `Co(BO_(2))_(2)`

Answer

To determine which of the given substances are green, we will analyze each option based on their known colors.

### Step-by-Step Solution:

1. **Identify the substances**: The substances given are:
- FeBO2O3
- CuCrBO2O3
- CoBO2O2

2. **Analyze the color of FeBO2O3**:
- FeBO2O3 (Iron(III) borate) is known to exhibit a green color.

3. **Analyze the color of CuCrBO2O3**:
- CuCrBO2O3 (Copper chromate borate) is also known to display a green color.

4. **Analyze the color of CoBO2O2**:
- CoBO2O2 (Cobalt(II) borate) typically shows a blue color.

5. **Summarize the findings**:
- From the analysis:
- FeBO2O3 is green.
- CuCrBO2O3 is green.
- CoBO2O2 is blue.

6. **Conclusion**:
- The substances that are green are:
- FeBO2O3 (Option A)
- CuCrBO2O3 (Option C)

### Final Answer:
The substances that are green are **FeBO2O3 and CuCrBO2O3**.

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