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.

• A. (a)-(iii), (b)-(ii), (c)-(iv), (d)-(i)
• B. (a)-(i), (b)-(ii), (c)-(iii), (d)-(iv)
• C. (a)-(ii), (b)-(iii), (c)-(iv), (d)-(i)
• D. (a)-(iv), (b)-(iii), (c)-(i), (d)-(ii)

Answer 1

The Correct Option is D

To match List - I with List - II, we need to understand the processes and their environmental impacts: 

1. (a) \(2\text{SO}_2 (\text{g}) + \text{O}_2 (\text{g}) \rightarrow 2\text{SO}_3\): This reaction is associated with the formation of sulfuric acid in the atmosphere, leading to acid rain. Therefore, this corresponds to List - II (i).
2. (b) \(\text{HOCl}(\text{g}) \overset{h\nu}{\rightarrow} \text{OH} + \text{Cl}\): The photodissociation of HOCl in the presence of sunlight produces hydroxyl radicals and chlorine radicals. This reaction is a part of the catalytic ozone depletion cycle, affecting the ozone layer. Thus, it matches List - II (iii).
3. (c) \(\text{CaCO}_3 + \text{H}_2\text{SO}_4 \rightarrow \text{CaSO}_4 + \text{H}_2\text{O} + \text{CO}_2\): This reaction involves calcium carbonate reacting with sulfuric acid, a component of acid rain, which damages building materials and monuments. So it aligns with List - II (i).
4. (d) \(\text{NO}_2(\text{g}) \overset{h\nu}{\rightarrow} \text{NO}(\text{g}) + \text{O}(\text{g})\): The photodissociation of nitrogen dioxide leads to the formation of nitric oxide and atomic oxygen. This process occurs in the troposphere and contributes to the formation of photochemical smog. Hence, it corresponds to List - II (ii).

Given these analyses, the correct match is:

List - I	List - II
(a)	(iv) Acid rain
(b)	(iii) Ozone
(c)	(i) Acid rain
(d)	(ii) Smog

Thus, the correct answer is: (a)-(iv), (b)-(iii), (c)-(i), (d)-(ii).