Question

Which of the following reactions is an example of autoreduction?

पर्याय

• $$\mathrm{Fe}{\phantom{A}}_3\mathrm{O}{\phantom{A}}_4+4\mathrm{CO}⟶3\mathrm{Fe}+4\mathrm{CO}{\phantom{A}}_2$$

• $$\mathrm{Cu}{\phantom{A}}_2\mathrm{O}+\mathrm{C}⟶2\mathrm{Cu}+\mathrm{CO}$$

• $$\mathrm{Cu}{\phantom{A}}^{2+}(\mathrm{aq})+\mathrm{Fe}(\mathrm{s})⟶\mathrm{Cu}(\mathrm{s})+\mathrm{Fe}{\phantom{A}}^{2+}(\mathrm{aq})$$

• $$\mathrm{Cu}{\phantom{A}}_2\mathrm{O}+\frac{1}{2}\mathrm{Cu}{\phantom{A}}_2\mathrm{S}⟶3\mathrm{Cu}+\frac{1}{2}\mathrm{SO}{\phantom{A}}_2$$

Answer 1

$$\mathrm{Cu}{\phantom{A}}_2\mathrm{O}+\frac{1}{2}\mathrm{Cu}{\phantom{A}}_2\mathrm{S}⟶3\mathrm{Cu}+\frac{1}{2}\mathrm{SO}{\phantom{A}}_2$$

Explanation:

This reaction includes reduction of copper (I) oxide by copper (I) sulphide. In this process, copper is reduced by itself hence this process is known as autoreduction and the solidified copper so, obtained is known as blister copper.