Which of the following is a carbonate ore?

Which of the following is not an iron ore?

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

The formula of haematite is

Which of the following statements is incorrect?

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