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Match List-I with List-II: List-I: (P) Carbon dioxide, (Q) Water vapour, (R) Ozone, (S) Sulphur dioxide. List-II: (1) Greenhouse gas, (2) Linear, (3) Unstable, (4) Responsible for acid rain, (5) Oxidizing agent. Choose the correct matching.

1. P -> 1,2; Q -> 1,3; R -> 1,3,5; S -> 3,4
2. P -> 1,2,4; Q -> 1,3; R -> 3,5; S -> 1,2,4
3. P -> 1,2; Q -> 1,3; R -> 1,5; S -> 1,2,5
4. P -> 1,2; Q -> 3; R -> 1,5; S -> 1,2,4

Correct answer: P -> 1,2; Q -> 1,3; R -> 1,3,5; S -> 3,4

Solution

CO2: greenhouse gas (1) and linear molecule (2). Water vapour: greenhouse gas (1) and thermally unstable in the upper atmosphere (3). Ozone (O3): greenhouse gas in troposphere (1), thermally unstable (3), and strong oxidizing agent (5). SO2: thermally unstable (3), causes acid rain (4). Option A matches P->1,2; Q->1,3; R->1,3,5; S->3,4.

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