Question

Carbon can be used to reduce the number of oxides and other compounds, and because of the low cost and availability of coke, this method is widely used. But the disadvantages are that:

• A. high temperature is needed, which is expensive
• B. many metals combine with carbon to form carbides
• C. low temperature is needed, which is expensive
• D. many metal combine with carbon and do not form carbides

Answer 1

Answer: (A), (B)

The correct options are
A many metals combine with carbon to form carbides
B high temperature is needed, which is expensive

Carbon is used for high temperature chemical reduction method.

Example:

$F{e}_2{O}_3+C\stackrel{\text{blast furnace}}{\to }Fe$

$ZnO+C\stackrel{{1200}^{\circ }C}{\to }Zn$

But the disadvantage of this method are that a high temperature is needed, which is expensive and requires the use of a blast furnace. And many metals combine with carbon, forming carbides.

Hence, the correct options are (A) and (B).