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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Living in the atmosphere of CO is dangerous because it : 

1. Combines with Opresent inside to form CO2

2. Reduces organic matter of tissues.

3. Combines with haemoglobin and makes it incapable to absorb oxygen.

4. Dilutes the blood.

Subtopic:  Air Pollution - Smog |
 94%
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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 incorrect statement about carbon monoxide is-

1. It reduces the oxygen-carrying ability of blood.
2. The carboxyhaemoglobin (haemoglobin bound to CO) is less stable than oxyhaemoglobin.
3. It is produced due to incomplete combustion.
4. It forms carboxyhaemoglobin.

Subtopic:  Air Pollution - Smog |
 86%
From NCERT
NEET - 2020
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A factory was started near a village. Suddenly villagers started feeling the presence of irritating vapors in the village and cases of headache, chest pain, cough, dryness of throat, and breathing problems increased. Villagers blamed the emissions from the chimney of the factory for such problems. This is : 

1. Due to the burning of fossil fuels such as gasoline, coal, natural gas, etc.

2. Due to the burning of toxic soil.

3. Due to the burning of white Phosphorus in soil.

4. Due to Excessive sound pollution.

Subtopic:  Air Pollution - Smog |
 84%
From NCERT
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A gas that is not common component of photochemical smog is-

1. Ozone

2. Acrolein

3. Peroxyacetyl nitrate

4. Chlorofluorocarbons

Subtopic:  Air Pollution - Smog |
 65%
From NCERT
NEET - 2014
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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 gas that damages the ozone layer is -

1. CFCs 

2. CO2

3. CH

4. SO2

Subtopic:  Air Pollution - Ozone |
 93%
From NCERT
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Ozone is a very toxic gas and a strong oxidizing agent. It is still useful for life on earth :

1. because it traps harmful UV-rays.

2. because it balances global warming.

3. because it traps harmful X-rays.

4. because it  traps harmful γ-rays.

Subtopic:  Air Pollution - Ozone |
 92%
From NCERT
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