Out of the following reduction processes :
(i) `Fe_(2)O_(3) + 3C rarr 2Fe + 3CO`
(ii) `Cu_(2)O +C rarr 2Cu + CO`
(iii) `PbO + C rarr Pb + CO`
(iv) `ZnO + C rarr Zn + CO`
Correct process is//are :

Options

A. (i)
B. (ii)
C. (iii)
D. (iv)

Answer

To determine which of the given reduction processes are correct, we will analyze each reaction step by step.

### Step 1: Analyze the first reaction
**Reaction:** `Fe2O3 + 3C → 2Fe + 3CO`

- **Analysis:** Iron (III) oxide (Fe2O3) can be reduced by carbon. In this reaction, carbon acts as a reducing agent, converting Fe2O3 into iron (Fe) and carbon monoxide (CO). This reaction is thermodynamically favorable and is commonly used in metallurgy.

**Conclusion:** This process is correct.

### Step 2: Analyze the second reaction
**Reaction:** `Cu2O + C → 2Cu + CO`

- **Analysis:** Copper (I) oxide (Cu2O) is not typically reduced by carbon to form copper (Cu) and carbon monoxide (CO). Instead, copper (I) oxide is more commonly reduced by other agents such as hydrogen or by heating with metallic copper. Therefore, this reaction does not proceed as written.

**Conclusion:** This process is incorrect.

### Step 3: Analyze the third reaction
**Reaction:** `PbO + C → Pb + CO`

- **Analysis:** Lead (II) oxide (PbO) can be effectively reduced by carbon. In this reaction, carbon reduces PbO to lead (Pb) while producing carbon monoxide (CO). This is a well-known reduction process in metallurgy.

**Conclusion:** This process is correct.

### Step 4: Analyze the fourth reaction
**Reaction:** `ZnO + C → Zn + CO`

- **Analysis:** Zinc oxide (ZnO) can also be reduced by carbon. The reaction yields zinc (Zn) and carbon monoxide (CO). This reduction is also commonly used in the extraction of zinc from its ores.

**Conclusion:** This process is correct.

### Final Conclusion
The correct reduction processes from the given options are:
- (i) `Fe2O3 + 3C → 2Fe + 3CO` (Correct)
- (ii) `Cu2O + C → 2Cu + CO` (Incorrect)
- (iii) `PbO + C → Pb + CO` (Correct)
- (iv) `ZnO + C → Zn + CO` (Correct)

Thus, the correct processes are (i), (iii), and (iv).

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