The impurities associated with minerals used in metallurgy are collectively called:

Among the following ores: Bauxite,Siderite,Cuprite,Calamine,Haematite,Kaolinite,Malachite,Magnetite,Sphalerite,Limonite,Cryolite,the number of principal ores of iron is $......$

Which one of the following sets is not correctly matched?

Define the following terms:
$(i)$. Minerals
$(ii)$. Ores
$(iii)$. Metallurgy
$(iv)$. Gangue

Which element is found in free state?

The one that is not a carbonate is