Consider the following statements.
I : Pig iron is malleable and ductile.
II : Pig iron can be melted to produce cast iron of desired shapes.
III : Wrought iron is obtained by heating pig iron with iron oxide in a furnace.
Which of the statement(s) given above is/are correct?
State the use of:
(a) Cast Iron, (b) Wrought Iron,
(c) Mild steel, (d) Hard steel.