Q.
Match Column I with Column II Choose the correct answer from the options given.
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a
1
b
2
c
3
d
4
answer is C.
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Detailed Solution
1ppm of F- in water-prevent tooth decay1.5 ppm of F- in water-tooth to become mottledGrater than than 1.5 ppm of F- in water-water become poisonous
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