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Water pollution, BOD and COD
JEE Main level
Single correct option
Difficulty 2 of 3
ev131
Following the standard NCERT treatment, the maximum permitted concentration of lead in drinking water is:
A
50 ppb
B
5 ppm
C
50 ppm
D
0.5 ppb
Answer: A
The standard value for lead is 50 ppb, which is
50
μ
g
per litre. The value 50 ppm would be 1000 times higher.
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