4. 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. the water is unsuitable for drinking due to high concentration of 1/ lead 2. nitrate 3. iron 4. fluoride

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Q. 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:

Q. The concentration of fluoride, lead, nitrate and iron in a water sample from an underground lake was found to be

1000 p p b, 40 p p b, 100 p p m

and

0.2 p p m

, respectively. This water is unsuitable for drinking due to high concentration of :

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

Q. Match the upper limit concentration of the pollutants given in column I with column II and mark the appropriate choice.

	Column I		Column II
(A)	Lead	(i)	500 ppm
(B)	Sulphate	(ii)	10 ppm
(C)	Nitrate	(iii)	50 ppb
(D)	Fluoride	(iv)	50 ppm

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