Correct answer: (b) 2 and 4 only
Explanation
- A
1, 2 and 3
1, 2 and 3. CO and ozone are not the classic acid-rain pair.
- B
2 and 4 only
2 and 4 only. Nitrogen oxides and sulphur dioxide → nitric and sulphuric acids in rain. Not CO, not ozone as the acid-rain cause.
- C
4 only
4 only. NOx is also a driver.
- D
1, 3 and 4
1, 3 and 4. Carbon monoxide is not an acid-rain precursor here.
Summary. Official key is (b) 2 and 4 only. Acid rain is chiefly from SO2 and NOx. Carbon monoxide and ozone are air pollutants with other harms, not the acid-rain couple in this list.
PYQ trend
When UPSC asked this
Related PYQs from other years, newest first. Open a question to read it.
-
2021 · Q17 · General Studies · 2 marks
Why is there a concern about copper smelting plants? 1. They may release lethal quantities of carbon monoxide into environment. 2. The copper slag can cause the leaching of some heavy metals into environment. 3. They may release sulphur dioxide as a pollutant. Select the correct answer using the code given below -
2021 · Q18 · General Studies · 2 marks
With reference to furnace oil, consider the following statements: 1. It is a product of oil refineries. 2. Some industries use it to generate power. 3. Its use causes sulphur emissions into environment. Which of the statements given above are correct? -
2020 · Q79 · General Studies · 2 marks
Consider the following statements: 1. Coal ash contains arsenic, lead and mercury. 2. Coal-fired power plants release sulphur dioxide and oxides of nitrogen into the environment. 3. High ash content is observed in Indian coal. Which of the statements given above is/are correct? -
2019 · Q35 · General Studies · 2 marks
Consider the following: 1. Carbon monoxide 2. Methane 3. Ozone 4. Sulphur dioxide Which of the above are released into atmosphere due to the burning of crop/biomass residue? -
2019 · Q41 · General Studies · 2 marks
Consider the following statements: 1. Agricultural soils release nitrogen oxides into environment. 2. Cattle release ammonia into environment. 3. Poultry industry releases reactive nitrogen compounds into environment. Which of the statements given above is/are correct? -
2019 · Q43 · General Studies · 2 marks
In the context of proposals to the use of hydrogen- enriched CNG (H-CNG) as fuel for buses in public transport, consider the following statements: 1. The main advantage of the use of H-CNG is the elimination of carbon monoxide emissions -
2016 · Q86 · General Studies · 2 marks
In the cities of our country, which among the following atmospheric gases are normally considered in calculating the value of Air Quality Index? 1. Carbon dioxide 2. Carbon monoxide 3. Nitrogen dioxide 4. Sulfur dioxide 5. Methane Select the correct answer using the code given below