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Environmental Chemistry · Question 10

NEET 2013 (Karnataka)MCQEasy📈 Topic in 12% papers+4−1
1

Which one of the following statements is not true?

  1. Clean water would have a BOD value of 5 ppm.
  2. Fluoride deficiency in drinking water is harmful. Soluble fluoride is often used to bring its concentration up to 1 ppm.
  3. When the pH of rain water is higher than 6.5, it is called acid rain.
  4. Dissolved Oxygen (DO) in cold water can reach a concentration up to 10 ppm.

Answer

(3) When the pH of rain water is higher than 6.5, it is called acid rain.

Solution

As per NCERT, normally rain water has a pH of 5.6 due to dissolved CO2; when the pH of rain water drops below 5.6, it is called acid rain.

Statement (3) is not true.

Clean water has a BOD of less than 5 ppm, soluble fluoride is added to bring fluoride up to 1 ppm, and dissolved oxygen in cold water can reach about 10 ppm.

Answer: (3)

Out of syllabusNEET 2013 (Karnataka)

Keep practising — Environmental Chemistry

2

Which one of the following statements regarding photochemical smog is not correct?

  1. Carbon monoxide does not play any role in photochemical smog formation.
  2. Photochemical smog is an oxidising agent in character.
  3. Photochemical smog is formed through photochemical reaction involving solar energy.
  4. Photochemical smog does not cause irritation in eyes and throat.
Out of syllabusAIPMT 2012 (Prelims)
3

Which one of the following statements is not true?

  1. pH of drinking water should be between 5.5–9.5.
  2. Concentration of DO below 6 ppm is good for the growth of fish.
  3. Clean water would have a BOD value of less than 5 ppm.
  4. Oxides of sulphur, nitrogen and carbon are the most widespread air pollutants.
Out of syllabusAIPMT 2011 (Prelims)
4

Green chemistry means such reactions which

  1. are related to the depletion of ozone layer
  2. study the reactions in plants
  3. produce colour during reactions
  4. reduce the use and production of hazardous chemicals
Out of syllabusAIPMT 2008

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