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Which of the following pairs contains ONLY herbicides?

1. Aldrin and Dieldrin
2. Sodium chlorate and Aldrin
3. Sodium arsenite and Dieldrin
4. Sodium chlorate and sodium arsenite

Correct answer: Sodium chlorate and sodium arsenite

Solution

Aldrin and dieldrin are insecticides; sodium chlorate and sodium arsenite are both herbicides, so the only all-herbicide pair is the last one.

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