Question

Blister copper is :

• A. Electrically refined copper
• B. A mixture of impure copper and silver
• C. Copper containing 2% impurity
• D. Present in the anode mud in an electrolytic process

Answer 1

The correct option is C

Copper containing 2% impurity

Explanation for correct option

(C)Copper containing 2% impurity

• In the process of extraction of copper, blister copper is obtained by the reduction of copper matte.
• Copper containing $2\%$ impurity is known as blister copper.
• The reaction for the formation of blister copper is as follows:-

$$\begin{gathered} {\text{2Cu}}_{\text{2}}\text{S}\left(\mathrm{s}\right){\text{+ 3O}}_{\text{2}}\left(\mathrm{g}\right){\text{→ 2Cu}}_{\text{2}}\text{O}\left(\text{s}\right){\text{+ 2SO}}_{\text{2}}\left(\text{g}\right) \\ {\text{2Cu}}_{\text{2}}\text{O}\left(\text{s}\right){\text{+ Cu}}_{\text{2}}\text{S}\left(\mathrm{s}\right)\text{→ 6Cu}\left(\text{s}\right){\text{+ SO}}_{\text{2}}\left(\text{g}\right) \end{gathered}$$

• The solidified copper obtained has a blistered appearance due to the evolution of ${\mathrm{SO}}_2$ and so it is called blister copper.

Explanation for incorrect option

Blister copper is copper containing $2\%$ impurity . Hence, options (A), (B), and (D) are incorrect.

Hence, option (C) is correct. Blister copper is copper containing $2\%$ impurity.