Question

Which of the following is not an ore?

Answer 1

Pig iron: The iron obtained from Blast furnace
contains about 4% carbon and many impurities in smaller amount (e.g., S, P, Si, Mn). This is known as pig iron.
All others are ore.
$\text{Malachite}\to Cu(OH{)}_2.CuC{O}_3$
$\text{Zinc blends}\to ZnS$
$\text{Bauxite}\to A{l}_2{O}_3.2H_{2}O$