![The optimum value in natural water is ________](https://www.gkseries.com/blog/wp-content/uploads/2022/01/The-optimum-value-in-natural-water-is-________.png)
Q. The optimum value in natural water is ________
A. 2-4ppm
B. 4-7ppm
C. 4-6ppm
D. 2-7ppm
Answer: 4-6ppm
A. 2-4ppm
B. 4-7ppm
C. 4-6ppm
D. 2-7ppm
Answer: 4-6ppm
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