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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Match Column I with Column II Choose the correct answer from the options given.