First slide

Water pollution , major water pollutants

Question

Correct statement among the following is

Easy

A

$[{SO}_{4}^{- 2}] >$ 50 ppm causes laxative effect
B

$[F^{-}] <$ 1 ppm causes brown mottling of teeth
C

DO < 4 ppm indicates good quality water
D

Pb > 50 ppm causes kidney damage

Solution

$[{SO}_{4}^{- 2}] >$ 500 ppm causes laxative effect.
$[F^{-}] >$ 10 ppm causes Brittleness of bones
$[F^{-}] <$ 1 ppm causes tooth decay.
Pb > 50 ppb causes Kidney damage.
$[{NO}_{3}^{-}]$ > 50 ppm causes Blue baby syndrome.
DO < 4 ppm is harmful and kills micro organisms and fish.
DO > 6 ppm indicates good quality water.

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