Match List - I with List - II. List - I List - II (a) 2SO 2 (g)+O 2 (g) →2SO 3 (i) Acid rain (b) HOCl(g) h $$^\nu$$ →OH+Cl (ii) Smog (c) CaCO 3 +H 2 SO 4 →CaSO 4 +H 2 O+CO 2 (iii) Ozone (d) NO 2 (g) $$^{h\nu}$$ →NO(g)+O(g) (iv) Tropospheric Choose the correct answer from the options given below.}

(a)-(iii), (b)-(ii), (c)-(iv), (d)-(i)

(a)-(i), (b)-(ii), (c)-(iii), (d)-(iv)

(a)-(ii), (b)-(iii), (c)-(iv), (d)-(i)

Question:

Match List - I with List - II.
List - I List - II
(a) 2SO₂ (g)+O₂ (g) →2SO₃ (i) Acid rain
(b) HOCl(g) ^h$^\nu$→OH+Cl (ii) Smog
(c) CaCO₃+H₂SO₄→CaSO₄+H₂O+CO₂ (iii) Ozone
(d) NO₂(g) $^{h\nu}$→NO(g)+O(g) (iv) Tropospheric
Choose the correct answer from the options given below.

Updated On: Nov 13, 2025

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To solve this question, we need to match each equation in List - I with their correct environmental phenomenon from List - II.

Examine equation (a): $2\text{SO}_2(g) + \text{O}_2(g) \rightarrow 2\text{SO}_3(g)$
- This reaction describes the formation of sulfur trioxide ($ \text{SO}_3 $), which can further react with water vapor in the atmosphere to form sulfuric acid ($ \text{H}_2\text{SO}_4 $). This process contributes to acid rain.
Examine equation (b): $ \text{HOCl(g)} \overset{h\nu}{\rightarrow} \text{OH + Cl} $
- This reaction involves photodissociation under ultraviolet light, which is related to the dynamics of the ozone layer. Chlorine radicals (Cl) are known to catalyze ozone depletion.
Examine equation (c): $\text{CaCO}_3 + \text{H}_2\text{SO}_4 \rightarrow \text{CaSO}_4 + \text{H}_2\text{O} + \text{CO}_2$
- This chemical reaction shows the reaction of calcium carbonate with sulfuric acid, which is a typical reaction involved in the deterioration of buildings due to acid rain.
Examine equation (d): $ \text{NO}_2(g) \overset{h\nu}{\rightarrow} \text{NO(g) + O(g)} $
- This reaction involves the photodissociation of nitrogen dioxide ($ \text{NO}_2 $), leading to the production of ozone and contributing to the formation of photochemical smog in the troposphere.

Based on these explanations, the correct matches are:

Therefore, the correct option is:

(a)-(iv), (b)-(iii), (c)-(i), (d)-(ii)

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