Match the column :

Options

A. `{:(Column I, ColumnII),("Self reduction",(p)"Lead"):}`
B. `{:(Column I, ColumnII),("Carbon reduction",(q)"Silver"):}`
C. `{:(Column I, ColumnII),("Complex formation and displacement by metal",(r)"Copper"):}`
D. `{:(Column I, ColumnII),("Decomposition of iodide",(s)"Boron"):}`

Answer

To solve the matching question between the processes in column 1 and the corresponding metals in column 2, we can follow these steps:

### Step 1: Identify the Processes
We have the following processes in column 1:
1. Self-reduction
2. Carbon reduction
3. Complex formation and displacement by metal
4. Decomposition of iodide

### Step 2: Identify the Metals
In column 2, we have:
1. Lead
2. Silver
3. Copper
4. Boron

### Step 3: Analyze Each Process

#### Self-reduction
- **Definition**: This process involves a metal ore reducing itself without the addition of an external reducing agent.
- **Metals Involved**: Lead (Pb) and Copper (Cu) are known to undergo self-reduction.
- **Reactions**:
- For Lead:
\[ 2PbS + 3O_2 \rightarrow 2PbO + 2SO_2 \]
\[ PbO + PbS \rightarrow Pb + SO_2 \]
- For Copper:
\[ 2Cu_2S + 3O_2 \rightarrow 2Cu_2O + 2SO_2 \]
\[ Cu_2O + Cu_2S \rightarrow 6Cu + SO_2 \]
- **Matching**: Self-reduction matches with **Lead (Pb)** and **Copper (Cu)**.

#### Carbon Reduction
- **Definition**: This process involves the reduction of metal oxides using carbon as a reducing agent.
- **Metal Involved**: Lead (Pb).
- **Reactions**:
\[ PbO + C \rightarrow Pb + CO \]
\[ PbO + CO \rightarrow Pb + CO_2 \]
- **Matching**: Carbon reduction matches with **Lead (Pb)**.

#### Complex Formation and Displacement by Metal
- **Definition**: This involves the formation of a complex and then displacement of a metal from that complex by a more reactive metal.
- **Metal Involved**: Silver (Ag).
- **Reactions**:
\[ Ag_2S + 4NaCN \rightarrow 2Na[Ag(CN)_2] + Na_2S \]
\[ Na[Ag(CN)_2] + Zn \rightarrow Zn(CN)_4 + Ag \]
- **Matching**: Complex formation and displacement matches with **Silver (Ag)**.

#### Decomposition of Iodide
- **Definition**: This process involves the thermal decomposition of boron iodide to produce boron.
- **Metal Involved**: Boron (B).
- **Reaction**:
\[ B_2I_4 \rightarrow 2B + 2I_2 \] (at high temperatures)
- **Matching**: Decomposition of iodide matches with **Boron (B)**.

### Final Matching
Now we can summarize the matches:
- Self-reduction → Lead (Pb) and Copper (Cu)
- Carbon reduction → Lead (Pb)
- Complex formation and displacement by metal → Silver (Ag)
- Decomposition of iodide → Boron (B)

### Conclusion
The final matches are:
- Self-reduction: Lead (Pb) and Copper (Cu)
- Carbon reduction: Lead (Pb)
- Complex formation and displacement by metal: Silver (Ag)
- Decomposition of iodide: Boron (B)