Question

Which of the following can be used as a reducing agent in smelting?

• A. Carbon
• B. Coke
• C. Carbon monoxide
• D. All of the above

Answer 1

The correct option is D

All of the above

Smelting is the process in which the oxides of comparatively less reactive metals like zinc, iron, copper, lead, tin etc, are reduced to molten metal with the help of reducing agents such as carbon, coke or carbon monoxide.
For eg:- $ZnO+C⟶Zn+CO\left(g\right)$