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The maximum allowable level of Nitrates in drinking water as set by U.S. is 45mg ${NO}_{3}^{-}$ ions per ${dm}^{3}$ , the level in ppm is

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answer is C.

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Detailed Solution

Given 45 mg

{NO}_{3}^{-} ion per {dm}^{3} = 45 mg/L

We know $1 mg/L = 1 ppm$ then

$45 mg/L = 45 ppm$

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