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Q.

Tolerable limits of lead and fluorides in drinking water according to international standard are respectively

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a

50ppm and 3ppm

b

50ppb and 1 ppm

c

50ppm and 5ppm

d

1 ppm and 50ppm

answer is B.

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50ppb to 1ppm
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Tolerable limits of lead and fluorides in drinking water according to international standard are respectively