Q. No.The reaction(s) involved in ozone layer depletion in the stratosphere is/are:
1.
2.
3.
4.
All of the above
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. |
The major pollutant(s) of water pollution is/are:
1. Pathogens.
2. Organic waste.
3. Chemical components.
4. All of the above.
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 |
The major source(s) of soil pollution is/are:
1. Industrial waste.
2. Fertilizers and pesticides.
3. Organic compost.
4. Both (1) are (2)
The example(s) of pesticide is/are-
1. Aldrin
2. Sodium chlorate
3. Dieldrin
4. Both (1) and (3)
The correct statement(s) regarding green chemistry is/are:
| 1. | It helps in decreasing environmental pollution. |
| 2. | It prevents or limits chemical pollutants from being introduced into the environment. |
| 3. | It reduces the use and generation of substances hazardous to the environment. |
| 4. | All of the above. |
The best measure(s) to control water pollution is/are:
| 1. | Compost should be preferred over chemical fertilizers. |
| 2. | The concentration of pollutants in the industrial plants should be checked regularly. |
| 3. | All industrial and chemical discharges should be made free from toxic metals before allowing them to enter a water body. |
| 4. | All of the above. |
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
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. |
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