Water becomes useless for drinking purpose if the fluoride ion concentration exceeds :
20 ppm
50 ppm
2-4 ppm
10 ppm
A
2-4 ppm
B
50 ppm
C
10 ppm
D
20 ppm
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Solution
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If the fluoride ion concentration in water exceeds 2-4 ppm, the water becomes useless for drinking purpose.
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