Which of the following is /are weedicids ?
A) Sodium chlorate
B) DDT
C) Sodium arsenate
D) BHC

Options

A. A,C
B. A,B
C. A,D
D. B,D

Answer

To determine which of the given options are weedicides, we need to analyze each option based on their properties and uses.

### Step-by-Step Solution:

1. **Understanding Weedicides**:
- Weedicides are chemicals specifically designed to kill unwanted plants (weeds) that compete with crops for nutrients, water, and sunlight.

2. **Analyzing Option A: Sodium Chlorate (NaClO3)**:
- Sodium chlorate is known to have herbicidal properties. It is used as a herbicide to control weeds.
- **Conclusion**: Sodium chlorate is a weedicid.

3. **Analyzing Option B: DDT (Dichlorodiphenyltrichloroethane)**:
- DDT is primarily an insecticide, not a weedicid. It was used to control insect populations, particularly for malaria control.
- **Conclusion**: DDT is not a weedicid.

4. **Analyzing Option C: Sodium Arsenate (Na3AsO3)**:
- Sodium arsenate has herbicidal properties and is used to control weeds. It can also be toxic to plants.
- **Conclusion**: Sodium arsenate is a weedicid.

5. **Analyzing Option D: BHC (Benzene Hexachloride)**:
- BHC is mainly used as an insecticide and has applications in medical treatments. It is not specifically used for weed control.
- **Conclusion**: BHC is not a weedicid.

### Final Answer:
The weedicides from the given options are:
- **A) Sodium Chlorate**
- **C) Sodium Arsenate**

Thus, the correct options are A and C.

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