Question

The process of heating the sulphide ore strongly in excess of air is called _____.

• A. Calcination
• B. Roasting
• C. Smelting
• D. Reduction

Hint:

Metallurgy shortcuts:
• Sulphide ore + excess air \( \rightarrow \) Roasting
• Carbonate ore + limited air \( \rightarrow \) Calcination

Answer 1

The Correct Option is B

Concept:
In metallurgy, different processes are used for extracting metals from ores. Important processes include:
• Calcination
• Roasting
• Smelting
• Reduction Roasting is the process of heating sulphide ores strongly in excess of oxygen or air.

Step 1: Understand roasting process.
During roasting:
• Sulphide ores are heated strongly
• Heating occurs in presence of excess air
• Sulphides convert into oxides Example: \[ 2ZnS + 3O_2 \rightarrow 2ZnO + 2SO_2 \]

Step 2: Understand calcination for comparison.
Calcination means heating ore:
• In absence of air or limited air Generally used for carbonate ores. Hence, not correct here.

Step 3: Analyze all options carefully.
Option (A): Calcination
Used mainly for carbonate ores without excess air. Incorrect. Option (B): Roasting
Heating sulphide ore strongly in excess air. Correct. Option (C): Smelting
Extraction of metal by melting. Incorrect. Option (D): Reduction
Removal of oxygen from oxide. Incorrect.

Step 4: Choose the correct answer.
Therefore, the required process is: \[ \boxed{\text{Roasting}} \] Hence, \[ \boxed{(2)\ \text{Roasting}} \]