Objective Type Questions \( \mathrm{P} \) Permissible level of nitr...

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Objective Type Questions
\( \mathrm{P} \)
Permissible level of nitrate ions in the drinking water is
W
(1) \( 40 \mathrm{ppm} \)
(2) \( 50 \mathrm{ppm} \)
(3) \( 60 \mathrm{ppm} \)
(4) \( 70 \mathrm{ppm} \)
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