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NEET 2013
Exam
NEET
Year
2013
Subject
Chemistry
Chapter
Environmental Chemistry

NEET 2013 · Chemistry · Environmental Chemistry

Which one of following statements is not true?

Which one of following statements is not true?

Options

  1. AClean water would have a BOD value of 5 ppm
  2. BFluoride deficiency in drinking water is harmful. Soluble fluoride is often used to bring its concentration upto 1 ppm
  3. CWhen the pH\mathrm{pH} of rain water is higher than 6.5 , it is called acid rain
  4. DDissolved Oxygen (DO) in cold water can reach a concentration upto 10ppm10 \mathrm{ppm}

Correct answer

C. When the pH\mathrm{pH} of rain water is higher than 6.5 , it is called acid rain

Step-by-step solution

The acid rain happens when the pH\mathrm{pH} of the water drops below 5.6. Related Theory The oxides of N2,C\mathrm{N}_2, C and SS mix with water during the precipitation. Non-metal axide +H2O→+\mathrm{H}_2 \mathrm{O} \rightarrow Acid Thus the pH of water decreases and acid rain is formed.
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