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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3ev158

According to the standard values of the NCERT treatment, select the correct statements.

  1. AThe fluoride concentration in drinking water should be kept at about 1 ppm
  2. BThe permitted nitrate concentration in drinking water is 50 ppm
  3. CThe permitted lead concentration is 50 ppm
  4. DThe permissible pH range of drinking water is 5.5 to 9.5

Answer: A, B, D

The standard limits are pH 5.5 to 9.5, nitrate 50 ppm and fluoride about 1 ppm. The limit for lead is 50 ppb, which is a thousand times smaller than 50 ppm, so that statement is false.
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