Which of the following is a major air pollutant responsible for acid rain?
A. CO
B. O₂
C. N₂
D. SO₂
Answer: Option D
Solution (By JKSSB Mock Tests)
Sulfur dioxide (SO₂) from burning of fossil fuels (coal, oil) reacts with water vapor to form sulfurous and sulfuric acids, causing acid rain. Nitrogen oxides (NOx) also contribute. CO is a toxic gas but does not form strong acid; O₂ and N₂ are normal atmospheric gases. Acid rain damages ecosystems, buildings, and soil.
Explanation:
Portland cement primarily consists of calcium silicates (C₃S and C₂S) along with aluminates. These are formed by heating limestone and clay.
Explanation:
Atomic radius increases down a group as the number of shells increases. Iodine (I) is in Period 5, below F (2), Cl (3), Br (4). Thus iodine has the largest atomic radius among these halogens.
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