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Given below are two statements:
Statement-I: If BOD is 4 ppm and dissolved oxygen is 8 ppm, then it is a good quality water.
Statement-II: If the concentration of zinc and nitrate salts are 5 ppm each, then it can be a good quality water.
In the light of the above statements, choose the most appropriate answer from the options given below:

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Both the statements I and II are incorrect

Statement I is correct but statement II is incorrect

Both the statements I and II are correct

Statement I is incorrect but statement II is correct

answer is B.

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Detailed Solution

$\to$ For clean water $BOD < 5 ppm$
$\to$ In cold water DO can reach upto 10 ppm
$\to$ Maximum limit of ${NO}_{3}^{-}$ is drinking water is 50 ppm
$\to$ Maximum prescribed concentration of Zn is 5 ppm

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