Which one of the following is not a common component of Photochemical Smog?
1. Ozone
2. Acrolein
3. Peroxyacetyl nitrate
4. Chlorofluorocarbons

Subtopic:  Air Pollution - Greenhouse Effect |
 67%
From NCERT
AIPMT - 2014
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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 upto 1 ppm.
3. When the pH of rainwater is higher than 6.5, it is called acid rain.
4. Dissolved Oxygen (DO) in cold water can reach a concentration upto 10 ppm.
Subtopic:  Air Pollution - Acid Rain | Water Pollution - Water Pollution & Portable Water |
 75%
From NCERT
NEET - 2013
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The incorrect statement among the following regarding photochemical smog is:

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 a photochemical reaction involving solar energy.
4. Photochemical smog does not cause irritation in the eyes and throat.

Subtopic:  Air Pollution - Smog |
 81%
From NCERT
AIPMT - 2012
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Which one of the following statements is not true?

1.  Concentration of dissolved oxygen below 5 ppm is good for the growth of fish.
2.  Clean water would have a BOD value of less than 5 ppm.
3.  Oxides of sulphur, nitrogen, and carbon are the most widespread air pollutant.
4. pH of drinking water should be between 6.5-8.5.

Subtopic:  Water Pollution - Biological Oxygen Demand |
 67%
From NCERT
AIPMT - 2011
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Green chemistry means such reactions that:

1. Produce colour during reactions.
2. Reduce the use and production of
hazardous chemicals.
3. Are related to the depletion of the ozone layer.
4. Study the reaction in plants.

Subtopic:  Air Pollution - Greenhouse Effect |
 89%
From NCERT
AIPMT - 2008
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