Different substances are classified as:

I) Pure substances                  

II) Homogeneous mixture

III) Heterogeneous mixture

A few common substances are listed below:

i) Air,      ii) Graphite,     iii) Gasoline,     iv) Diamond,     v) Tap water,     vi) Iron     vii) Sodium chloride      viii) Iodized salt  ix) Brass          

x) Oil and water

Which of the following represents the correct classification of the given substances ?