Question

Which of the following represents the roasting of the ore?

• A. \( 2\text{Cu}_2\text{S} + 3\text{O}_2 \rightarrow 2\text{Cu}_2\text{O} + \text{SO}_2 \)
• B. \( \text{ZnCO}_3 \rightarrow \text{ZnO} + \text{CO}_2 \)
• C. \( \text{ZnO} + \text{C} \rightarrow \text{Zn} + \text{CO} \)
• D. \( \text{Cu}_2\text{S} + 2\text{Cu}_2\text{O} \rightarrow 6\text{Cu} + \text{SO}_2 \)

Hint:

Roasting typically involves heating metal sulfides in the presence of oxygen to form oxides and release sulfur dioxide.

Answer 1

The Correct Option is A

- Roasting is a metallurgical process that involves heating a sulfide ore in the presence of air (oxygen) to convert it into an oxide and release sulfur dioxide gas. This process is often used for ores like copper and zinc sulfides.
- Option (1) represents the roasting of copper sulfide (\( \text{Cu}_2\text{S} \)) to copper(I) oxide (\( \text{Cu}_2\text{O} \)) and sulfur dioxide (\( \text{SO}_2 \)), which is the correct roasting reaction.
- Option (2) represents the decomposition of zinc carbonate, which is calcination, not roasting.
- Option (3) represents a reduction reaction, which is not roasting.
- Option (4) represents a reaction that is not typically associated with roasting.
Thus, the correct answer is (1), which represents the roasting of copper ore.