Explanation
- A
Both Statement-II and Statement-III are correct and both of them explain Statement-I
Both II and III correct and both explain I. Rain weathers rock via dissolved CO2 (carbonation) and dissolved O2 (oxidation).
- B
Both Statement-II and Statement-III are correct, but only one of them explains Statement-I
Both II and III correct but only one explains I. Both processes are weathering routes.
- C
Only one of the Statements II and III is correct and that explains Statement-I
Only one of II/III correct. Both chemical facts are true.
- D
Neither Statement- II nor Statement-Ill is correct
Neither II nor III correct. Rainwater does carry CO2 and O2.
Summary. Official key is (a). Rainfall weathers rocks. Rainwater dissolves atmospheric carbon dioxide to form weak carbonic acid (carbonation of limestone and silicates) and carries dissolved oxygen (oxidation of iron-bearing minerals). Both II and III are true and both explain I.
Same topic · past papers
UPSC has asked this before
These previous-year questions sit on the same topic. Open one to practise the earlier ask.
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2025 · Q29 · General Studies · 2 marks
Consider the following statements: I. Without the atmosphere, temperature would be well below freezing point everywhere on the Earth's surface. II. Heat absorbed and trapped by the atmosphere maintains our planet's average temperature. III. Atmosphere's gases, like carbon dioxide, are particularly good at absorbing and trapping radiation. Which of the statements given above are correct? -
2024 · Q1 · General Studies · 2 marks
Consider the following statements : Statement-I : The atmosphere is heated more by incoming solar radiation than by terrestrial radiation. Statement-II : Carbon dioxide and other greenhouse gases in the atmosphere are good absorbers of long wave radiation. Which one of the following is correct in respect of the above statements ? -
2018 · Q57 · General Studies · 2 marks
Consider the following statements: 1. The Earth's magnetic field has reversed every few hundred thousand years. 2. When the Earth was created more than 4000 million years ago, there was 54% oxygen and no carbon dioxide. 3. When living organisms originated, they modified the early atmosphere of the Earth. Which of the statements given above is/are correct? -
2025 · Q31 · General Studies · 2 marks
Consider the following statements: Statement I: Studies indicate that carbon dioxide emissions from cement industry account for more than 5% of global carbon emissions. Statement II: Silica-bearing clay is mixed with limestone while manufacturing cement. Statement III: Limestone is converted into lime during clinker production for cement manufacturing. Which one of the following is correct in respect of the above statements? -
2025 · Q38 · General Studies · 2 marks
Consider the following statements: I. Carbon dioxide (CO2) emissions in India are less than 0.5 t CO2/ capita. II. In terms of CO2 emissions from fuel combustion, India ranks second in Asia-Pacific region. III. Electricity and heat producers are the largest source of CO2 emissions in India. Which of the statements given above is/are correct?