Match List-I with List-II.
List-I (Reaction) | List-II (Environmental process)
(a) 2SO₂(g) + O₂(g) →

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Question

Match List-I with List-II.
List-I (Reaction) | List-II (Environmental process)
(a) 2SO₂(g) + O₂(g) → 2SO₃(g) | (i) Acid rain
(b) HOCl(g) → OH + Cl | (ii) Smog
(c) CaCO₃ + H₂SO₄ → CaSO₄ + H₂O + CO₂ | (iii) Ozone depletion
(d) NO₂(g) → NO(g) + O(g) | (iv) Tropospheric pollution
Choose the correct answer from the options given below.

Accepted Answer

Correct Answer: D — (a)-(iv), (b)-(iii), (c)-(i), (d)-(ii)Step-by-step Solution:(a) 2SO2 + O2 → 2SO3: SO3 dissolves in moisture to form H2SO4, contributing to tropospheric pollution (iv).(b) HOCl → OH + Cl: The Cl radical produced reacts with ozone (Cl + O3 → ClO + O2), causing ozone depletion in the stratosphere (iii).(c) CaCO3 + H2SO4 → CaSO4 + H2O + CO2: This reaction represents the damage caused by acid rain on marble/limestone statues and buildings (i).(d) NO2 → NO + O: The oxygen atom reacts with O2 to form O3 (ozone), which is a key step in photochemical smog formation in the troposphere (ii).Why other options are incorrect: Options A, B, and C assign the environmental impacts incorrectly, particularly confusing acid rain with tropospheric pollution and smog with ozone depletion.Key Concept: Tropospheric pollution: SO2/SO3 from combustion. Ozone depletion (stratospheric): CFCs, HOCl releasing Cl radicals. Acid rain: H2SO4 and HNO3 from SO2 and NO2 dissolving in rain. Photochemical smog: NOx and hydrocarbons reacting in sunlight to form O3, PAN, etc.

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