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Which of the following is NOT used as a pesticide?

1. DDT
2. Organophosphates
3. Dieldrin
4. Sodium arsenite

Correct answer: Sodium arsenite

Solution

DDT and dieldrin are organochlorine insecticides and organophosphates are insecticides, all classed as pesticides. Sodium arsenite is used chiefly as a herbicide (weed killer), so it is the odd one out among pesticides as intended here.

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