Question

Which reducing agent is used in chemical reduction?

• A. C
• B. CO
• C. Al
• D. All of the above

Answer 1

Answer: (D)

All of the above

Smelting involves the reduction of the calcinated or roasted ore to the molten form by heating with carbon.

For the extraction of less electropositive metal powerful reducing agents such as C, $H_2$, CO water gas, Na, K, Mg, Al may be used.

In the case of reactive metals such as K, Na, Ca, Mg and Al have greater affinity for carbon and those carbides being thermally stable cannot be further reduced by carbon.