The concentration of fluoride, lead, nitrate and iron in a water sample from an underground lake was found to be 1000 ppb, 40 ppb, 100 ppm and 0.2 ppm, respectively. This water is unsuitable for drinking due to high concentration of :
← JEE Main 2016 · 3 Apr · Shift 1
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JEE Main 2016 · 3 Apr · Shift 1, Chemistry question 50
Answer and worked solution
Official answer: C
Against the usual limits (about 1 ppm fluoride, 50 ppb lead, 50 ppm nitrate, 0.2 ppm iron), only nitrate, at 100 ppm, is too high. Fluoride is at 1 ppm, lead at 40 ppb and iron at 0.2 ppm.
Topics:Water and soil pollution