Match Column-I with Column-II and select the correct answer from the given code:

Column-I: Column-II:

A. Limestone is heated. (i) Electrolysis
B. Magnesium wire is burnt in air. (ii) Decomposition Reaction
C. White ppt of AgCl is formed when $AgNO_{3}$ is added to NaCl solution. (iii) Combination Reaction
D. Electricity is passed through acidulated water. (iv) Double Displacement Reaction.

Code:

Question

Match Column-I with Column-II and select the correct answer from the given code:

Column-I: Column-II:

A. Limestone is heated.     (i) Electrolysis 
B. Magnesium wire is burnt in air.  (ii) Decomposition Reaction 
C. White ppt of AgCl is formed when $AgNO_{3}$ is added to NaCl solution. (iii) Combination Reaction
D. Electricity is passed through acidulated water.  (iv) Double Displacement Reaction.

Code:

Accepted Answer

To justify why Option 2 is the correct answer, let's analyze each statement in Column-I and match it with the appropriate reaction type in Column-II:

A. Limestone is heated.  
- This process involves the thermal decomposition of limestone (calcium carbonate, CaCO₃) into calcium oxide (CaO) and carbon dioxide (CO₂). This is a classic example of a decomposition reaction, where a single compound breaks down into two or more simpler substances. Therefore, A matches with (ii) Decomposition Reaction.

B. Magnesium wire is burnt in air.  
- When magnesium burns in air, it reacts with oxygen to form magnesium oxide (MgO). This is a combination reaction, where two or more substances combine to form a single product. Therefore, B matches with (iii) Combination Reaction.

C. White ppt of AgCl is formed when AgNO₃ is added to NaCl solution.  
- In this reaction, silver nitrate (AgNO₃) reacts with sodium chloride (NaCl) to form silver chloride (AgCl) as a white precipitate and sodium nitrate (NaNO₃). This is a double displacement reaction, where the ions of two compounds exchange places. Therefore, C matches with (iv) Double Displacement Reaction.

D. Electricity is passed through acidulated water.  
- This process involves the electrolysis of water, where water is decomposed into hydrogen and oxygen gases. This is an example of electrolysis, a process that uses electricity to drive a non-spontaneous chemical reaction. Therefore, D matches with (i) Electrolysis.

Now, let's see why Option 2 is correct:
- A-(ii): Limestone is heated, which is a decomposition reaction.
- B-(iii): Magnesium wire is burnt in air, which is a combination reaction.
- C-(iv): White ppt of AgCl is formed, which is a double displacement reaction.
- D-(i): Electricity is passed through acidulated water, which is electrolysis.

Explanation of why the other options are incorrect:
1. Option 1: A-(iv), B-(ii), C-(i), D-(iii)
   - A-(iv) is incorrect because heating limestone is a decomposition reaction, not a double displacement reaction.
   - B-(ii) is incorrect because burning magnesium is a combination reaction, not a decomposition reaction.
   - C-(i) is incorrect because the formation of AgCl is a double displacement reaction, not electrolysis.
   - D-(iii) is incorrect because passing electricity through water is electrolysis, not a combination reaction.

3. Option 3: A-(ii), B-(iv), C-(iii), D-(i)
   - B-(iv) is incorrect because burning magnesium is a combination reaction, not a double displacement reaction.
   - C-(iii) is incorrect because the formation of AgCl is a double displacement reaction, not a combination reaction.

4. Option 4: A-(i), B-(ii), C-(iv), D-(iii)
   - A-(i) is incorrect because heating limestone is a decomposition reaction, not electrolysis.
   - B-(ii) is incorrect because burning magnesium is a combination reaction, not a decomposition reaction.
   - D-(iii) is incorrect because passing electricity through water is electrolysis, not a combination reaction.

Thus, Option 2 is the only option where all matches are correct according to the descriptions of the reactions.