Match the Column-I with Column-II :
Column - I – Column - II
(a) Photochemical decomposition – (i) 2KClO$_{3(s)}$ → 2KCl$_{(s)}$ + 3O$_{2(g)}$
(b) Thermal decomposition – (ii) 2Al$_2$O$_{3(m)}$ → 4Al$_{(s)}$ + 3O$_{2(g)}$
(c) Electrolysis – (iii) Mg$_{(s)}$ + CuSO$_{4(aq)}$ → MgSO$_{4(aq)}$ + Cu$_{(s)}$
(d) Displacement reaction – (iv) 2AgBr$_{(s)}$ → 2Ag$_{(s)}$ + Br2$_{(g)}$
Correct option is :

Question

Match the Column-I with Column-II : 
Column - I – Column - II 
(a) Photochemical decomposition – (i) 2KClO$_{3(s)}$ → 2KCl$_{(s)}$ + 3O$_{2(g)}$ 
(b) Thermal decomposition – (ii) 2Al$_2$O$_{3(m)}$ → 4Al$_{(s)}$ + 3O$_{2(g)}$ 
(c) Electrolysis – (iii) Mg$_{(s)}$ + CuSO$_{4(aq)}$ → MgSO$_{4(aq)}$ + Cu$_{(s)}$ 
(d) Displacement reaction – (iv) 2AgBr$_{(s)}$ → 2Ag$_{(s)}$ + Br2$_{(g)}$
Correct option is :

Accepted Answer

To justify why Option 1 is the correct answer, let's analyze each reaction type and match them with the appropriate reactions from Column-II.

1. **Photochemical decomposition**: This type of reaction involves the decomposition of a compound using light energy. The reaction given in Column-II that matches this description is (iv) 2AgBr$_{(s)}$ → 2Ag$_{(s)}$ + Br$_2$$_{(g)}$. Silver bromide (AgBr) decomposes into silver and bromine gas when exposed to light, which is a classic example of a photochemical decomposition reaction. Therefore, (a)-(iv) is the correct match.

2. **Thermal decomposition**: This reaction involves the breakdown of a compound due to heat. The reaction (i) 2KClO$_3$$_{(s)}$ → 2KCl$_{(s)}$ + 3O$_2$$_{(g)}$ fits this description as potassium chlorate decomposes into potassium chloride and oxygen gas upon heating. Thus, (b)-(i) is the correct match.

3. **Electrolysis**: This process involves the decomposition of a compound using an electric current. The reaction (ii) 2Al$_2$O$_3$$_{(m)}$ → 4Al$_{(s)}$ + 3O$_2$$_{(g)}$ is an example of electrolysis, where aluminum oxide is decomposed into aluminum and oxygen gas using electricity. Therefore, (c)-(ii) is the correct match.

4. **Displacement reaction**: This type of reaction involves an element displacing another element in a compound. The reaction (iii) Mg$_{(s)}$ + CuSO$_4$$_{(aq)}$ → MgSO$_4$$_{(aq)}$ + Cu$_{(s)}$ is a displacement reaction where magnesium displaces copper from copper sulfate to form magnesium sulfate and copper. Hence, (d)-(iii) is the correct match.

Now, let's explain why the other options are incorrect:

- **Option 2**: This option incorrectly matches (a)-(i), (b)-(ii), (c)-(iii), (d)-(iv). The mismatch occurs because (a)-(i) is not a photochemical decomposition, and (d)-(iv) is not a displacement reaction.

- **Option 3**: This option incorrectly matches (a)-(iv), (b)-(ii), (c)-(iii), (d)-(i). The mismatch occurs because (c)-(iii) is not electrolysis, and (d)-(i) is not a displacement reaction.

- **Option 4**: This option incorrectly matches (a)-(iv), (b)-(ii), (c)-(i), (d)-(iii). The mismatch occurs because (c)-(i) is not electrolysis.

In conclusion, Option 1 is the correct answer as it accurately matches each reaction type from Column-I with the appropriate reaction from Column-II based on the definitions and characteristics of each type of reaction.