Question

Blister copper is given its name because of the evolution of

• A. $H_2$
• B. $CO_2$
• C. $SO_2$
• D. $Cl_2$

Hint:

Blister copper: - $\sim$98% pure - Surface full of blisters due to escaping $SO_2$ gas

Answer 1

The Correct Option is C

Concept: Blister copper is obtained during the extraction of copper from its sulphide ores. It contains about 98% pure copper and has a blistered surface due to the evolution of gas.

Step 1: Formation of blister copper.
During the refining process, copper(I) sulphide reacts with copper(I) oxide: \[ Cu_2S + 2Cu_2O \rightarrow 6Cu + SO_2 \]

Step 2: Reason for blister formation.
The $SO_2$ gas produced escapes from molten copper, creating bubbles or blisters on the surface.

Step 3: Final conclusion.
Thus, blister copper gets its name due to evolution of: \[ SO_2 \]