Environmental chemistry is best defined as : 

1. Study of chemical processes in nature.

2. Study of biochemical processes in nature.

3. Both (1) and (2) 

4. None of the above.

Subtopic:  Introduction |
 81%
From NCERT
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Tropospheric pollution arises due to the presence of:

1. SO2, SO3, and NO2, in the lowest layer of the atmosphere.
2. SO2, SO3, and NO2, in the uppermost layer of the atmosphere.
3. SO2, SO3, and NO2, in the middle layer of the atmosphere.
4. All of the above.

Subtopic:  Air Pollution - Greenhouse Effect |
 75%
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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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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Statues and monuments in India are affected by acid rain because of the formation of : 

1. CaSO4 on the reaction of acid rain with limestone.
2. CaCO3 on the reaction of acid rain with limestone.
3. Ca(HCO3)2 on the reaction of acid rain with limestone.
4. None of the above.

Subtopic:  Air Pollution - Acid Rain |
 61%
From NCERT
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The correct statement(s) regarding photochemical smog is/are:

1. It occurs in a dry, sunny climate.
2. It is oxidizing in nature.
3. It is composed of  PAN, acrolein, formaldehyde, nitrogen oxide, and ozone.
4. All of the above.

Subtopic:  Air Pollution - Smog |
 93%
From NCERT
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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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The reaction(s) involved in ozone layer depletion in the stratosphere is/are:

1.
2.
3.
4. All of the above


 

Subtopic:  Air Pollution - Ozone |
 93%
From NCERT
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Consequence(s) of ozone hole is/are:

1. They cause death of many phytoplanktons.
2. Excess exposure may even cause mutation in plants. 
3. It leads to the ageing of skin, cataracts, skin cancer, and sunburns.
4. All of the above.

Subtopic:  Air Pollution - Ozone |
 95%
From NCERT
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The major pollutant(s) of water pollution is/are:

1. Pathogens.

2. Organic waste.

3. Chemical components.

4. All of the above.

Subtopic:  Water Pollution - Causes |
 89%
From NCERT
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