Question

which of the following is true of iron?
a. it has the highest electrical conductivity of any metal.
b. it can exist in many alloys, usually with a carbon base.
c. it is highly valuable, has symbolic meaning, and widely used.
d. it is a durable metal and is commonly used for casting.
please select the best answer from the choices provided

Explanation:

• Option a: Silver has higher electrical conductivity than iron.
• Option b: Iron - carbon alloys are common, but it's not "usually with a carbon base" in the sense that there are many other alloying elements.
• Option c: Gold is more highly valued in terms of high - value precious metals with symbolic meaning in some contexts (like jewelry for gold).
• Option d: Iron is a durable metal and is commonly used for casting (e.g., cast - iron cookware, cast - iron pipes).

Answer:

D. It is a durable metal and is commonly used for casting.