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

○ a
○ b
○ c
○ d

Explanation:

• Option a: Silver has higher electrical conductivity than iron.
• Option b: Iron - based alloys usually have an iron base, not a carbon base. Carbon is an important alloying element in steel (an iron - carbon alloy), but the base metal is iron.
• Option c: Gold is more commonly associated with being highly valuable, having symbolic meaning, and being widely used in jewelry etc. Iron is more of a base metal in terms of value perception compared to gold.
• Option d: Iron is a durable metal. Cast iron is a well - known material used for casting various objects like engine blocks, pipes, etc.

Answer:

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