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a
Bauxite
b
Malachite
c
Zinc blende
d
Pig iron
answer is D.
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Detailed Solution
Pig iron →It is the most impure form of iron and contains highest proportion of carbon (2.5-4%)Malachite→Cu(OH)2.CuCO3Zinc blende→ZnsBauxite→Al2O3.2H2O