Q. Arrange the following in the decreasing order of their carbon content
I. Cast iron
II. Wrought iron
III. Steel
Answer:
I, III, II
Notes: Cast iron is actually an iron-carbon-silicon alloy containing between 3 percent and 5.5 percent carbon. Wrought iron is an iron alloy with very low carbon content in contrast to cast iron i.e.2.1% to 4%. Steel is an alloy of iron that contains up to about 2.4 percent carbon.