The reaction/s involved during the formation of photochemical smog are:

\(1. \space NO_2(g) \rightarrow NO(g) + \stackrel{\cdot}{O(g)}\)

\(2. \stackrel{\cdot}{O(g)} + O_2(g) \rightarrow O_3(g)\)

\(3.\space O_3(g) + NO(g) \rightarrow NO_2(g) + O_2(g)\)

4. All of the above

Subtopic:  Air Pollution - Smog |
 89%
From NCERT
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Biochemical Oxygen Demand (BOD) is-

1. Amount of oxygen required by bacteria to decompose organic matter in a certain volume of a sample of water.
2. Amount of CO2 required by bacteria to decompose organic matter in a certain volume of a sample of water.
3. Amount of O3 required by bacteria to decompose organic matter in a certain volume of a sample of water.
4.  None of the above

Subtopic:  Water Pollution - Biological Oxygen Demand |
 92%
From NCERT
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The major source(s) of soil pollution is/are:

1. Industrial waste.

2. Fertilizers and pesticides.

3. Organic compost.

4. Both (1) are (2)

Subtopic:  Soil Pollution & Waste Management |
 87%
From NCERT
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The example(s) of pesticide is/are-

1. Aldrin

2. Sodium chlorate

3. Dieldrin

4. Both (1) and (3)

Subtopic:  Soil Pollution & Waste Management |
 90%
From NCERT
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Gases responsible for greenhouse effect are : 
1. Carbon dioxide (CO2)
2. Ozone (O3)
3. Nitrous oxide (N2O)
4. All of the above.

Subtopic:  Air Pollution - Greenhouse Effect |
 90%
From NCERT
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CO gas is more dangerous than CO2 gas because : 

1. CO is capable of forming a complex with haemoglobin (carboxyhemoglobin), that is more stable than the oxygen-haemoglobin complex. 

2. CO is capable of forming a complex with haemoglobin (carboxyhemoglobin), that is less stable than the oxygen-haemoglobin complex. 

3. CO2 is capable of forming a complex with haemoglobin (carboxyhemoglobin), that is more stable than the oxygen-haemoglobin complex. 

4. CO2 is capable of forming a complex with haemoglobin (carboxyhemoglobin), that is less stable than the oxygen-haemoglobin complex. 

Subtopic:  Air Pollution - Greenhouse Effect |
 91%
From NCERT
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In the absence of greenhouse gases -

1. Life on earth would be impossible.
2. Average temperature of the earth will decrease drastically.
3. There will be no effect on Earth
4. Both (1) and (2)

Subtopic:  Air Pollution - Greenhouse Effect |
 84%
From NCERT
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The correct statement about domestic waste is :

1. Only biodegradable domestic waste can be used as manure.
2. Non-biodegradable waste should be sent to industries for recycling.
3. It can be disposed off in a landfill.
4. All of the above.


 

Subtopic:  Soil Pollution & Waste Management |
 90%
From NCERT
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Among the following gases, the one that is not a greenhouse gas is :

1. CO

2. O3 

3. CH4

4. H2O vapor

Subtopic:  Air Pollution - Greenhouse Effect |
 59%
From NCERT
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Match the terms given in Column I with the compounds given in Column II.

Column I Column II
A. Acid rain 1. CHCl2-CHF2
B. Photochemical smog 2. CO
C. Combination with hemoglobin 3. Unsaturated hydrocarbons
D. Depletion of the ozone layer 4. SO2

Codes

A B C D
1. 4 2 3 1
2. 1 2 3 4
3. 4 3 2 1
4. 4 1 3 2
Subtopic:  Air Pollution - Acid Rain |
 88%
From NCERT
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