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Properties of Acids

Water becomes...

Question

Water becomes useless for drinking purpose if the fluoride ion concentration exceeds :

A

10 ppm

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B

50 ppm

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C

2-4 ppm

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D

20 ppm

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Solution

The correct option is C 2-4 ppm
If the fluoride ion concentration in water exceeds 2-4 ppm, the water becomes useless for drinking purpose.

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