Which one of the following statements is not true?
- A$pH$ of drinking water should be between $5.5 - 9.5$.
- BConcentration of $DO$ below $6 \ ppm$ is good for the growth of fish.
- CClean water would have a $BOD$ value of less than $5 \ ppm$.
- DOxides of sulphur,nitrogen and carbon are the most widespread air pollutants.
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Similar Questions
$A$ water sample has $ppm$ level concentration of following anions: $F^{-} = 10 \ ppm$,$SO_4^{2-} = 100 \ ppm$,$NO_3^{-} = 50 \ ppm$. The anion/anions that make the water sample unsuitable for drinking is/are:
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View SolutionWhat is responsible for soil pollution?
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View SolutionSulphur dioxide is one of the components of polluted air. $SO_{2}$ is also a major contributor to acid rain. The correct and complete reaction to represent acid rain caused by $SO_{2}$ is ..... .
Which of the following statements about the depletion of ozone layer is correct?
DifficultJEE MAIN 2014
View SolutionMatch List-$I$ with List-$II$.
List-$I$ List-$II$ $A$. Sulphate $(> 500 \ ppm)$ $I$. Methemoglobinemia $B$. Nitrate $(> 50 \ ppm)$ $II$. Brown mottling of teeth $C$. Lead $(> 50 \ ppb)$ $III$. Laxative effect $D$. Fluoride $(> 2 \ ppm)$ $IV$. Kidney damage
Choose the correct answer from the options given below.
| List-$I$ | List-$II$ |
| $A$. Sulphate $(> 500 \ ppm)$ | $I$. Methemoglobinemia |
| $B$. Nitrate $(> 50 \ ppm)$ | $II$. Brown mottling of teeth |
| $C$. Lead $(> 50 \ ppb)$ | $III$. Laxative effect |
| $D$. Fluoride $(> 2 \ ppm)$ | $IV$. Kidney damage |
Choose the correct answer from the options given below.
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