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BOD values (in ppm) for clean water (A) and polluted water (B) are expected respectively:

1. A > 50, B < 27
2. A > 25, B < 17
3. A < 5, B > 17
4. A > 15, B > 47

Correct answer: A < 5, B > 17

Solution

Clean water typically has very low BOD values, indicating minimal organic pollution, while polluted water has higher BOD values due to the presence of organic matter that consumes oxygen.

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