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 :
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 :
- (A)Both the statements I and II are incorrect
- (B)Statement I is incorrect but Statement II is correct
- (C)Both the statements I and II are correct✓ Correct
- (D)Statement I is correct but Statement II is incorrect
Answer: (C)
Solution
Statement I is correct: Clean water has a BOD (Biochemical Oxygen Demand) value of less than 5 ppm. A BOD of 4 ppm indicates good quality water with low organic pollution.
Statement II is correct: The maximum permissible limit of Zn in clean water is 5.0 ppm (or mg dm⁻³), and for it is 50 ppm (or mg dm⁻³). Since both zinc and nitrate are at or below their respective limits (5 ppm each), the water can be considered good quality.
Both statements are correct.
Statement II is correct: The maximum permissible limit of Zn in clean water is 5.0 ppm (or mg dm⁻³), and for it is 50 ppm (or mg dm⁻³). Since both zinc and nitrate are at or below their respective limits (5 ppm each), the water can be considered good quality.
Both statements are correct.
JEE Main · 2023 · 11 Apr 2023 · Shift 1 · Single correct option