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The concentration of fluoride , lead , n...

The concentration of fluoride , lead , nitrate and iron in a water sample from an underground lake was found to be 1000 pph , 40 ppb , 100 ppm and 0.2 ppm , respectively. This water is unsuitable for drinking due to high concentration of-

A

Iron

B

Fluoride

C

Lead

D

Nitrate

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