Which of the following is not a herbicide?

Options

A. Sodium chlorate
B. Sodium arsenite
C. Polyphosphate
D. Triazines

Answer

To determine which of the following options is not a herbicide, we can follow these steps:

### Step 1: Understand what a herbicide is
A herbicide is a type of chemical used to kill or inhibit the growth of unwanted plants, primarily weeds. They are specifically designed to target plant life without harming cultivated crops.

### Step 2: Analyze the options
We need to evaluate each of the given options to identify which one does not serve the purpose of a herbicide.

1. **Sodium Chlorate**: This is a chemical compound that is used as a herbicide to control weeds.
2. **Sodium Arsenate**: This compound is also used as a herbicide and is known for its effectiveness in killing unwanted vegetation.
3. **Triazine**: This refers to a class of herbicides that are widely used in agriculture to control weeds.
4. **Polyphosphate**: This is primarily used as a fertilizer and does not have the properties of a herbicide.

### Step 3: Identify the correct answer
From the analysis above, we can see that:
- Sodium chlorate, sodium arsenate, and triazine are all herbicides.
- Polyphosphate is a fertilizer and is not a herbicide.

Thus, the correct answer to the question "Which of the following is not a herbicide?" is **Polyphosphate**.

### Final Answer
**Polyphosphate** is not a herbicide.

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