Question

Which substance is a common reducing agent used in the production of metals from ores?

1) C
2) Na₂Cr2O7
3) H₂O
4) NaCl

Answer 1

Carbon (C) is a widespread reducing agent used for converting metal oxides into elemental metals during the smelting process in metallurgical operations.

Step-by-step explanation:

Carbon (C) is a common reducing agent used in the production of metals from ores. It is frequently used in the form of coke or coal. Carbon is utilized for the reduction of metal oxides to elemental metals in processes such as smelting.

For instance, in the extraction of iron from its ore, carbon is used to reduce iron oxide to metallic iron. While aluminum can also be a reducing agent, particularly for metals like molybdenum (Mo), tungsten (W), and chromium (Cr), and is noted for these special applications, it is generally more expensive than using carbon.