I. solder:tin
II.haematite:iran
III. bauxite:aluminium
IV.malachite:copper
I
II
III
IV
Explanation:
In all other pairs ,first name of the metal of which the second is an ore.on the other hand ,solder is an alloy.
In all other pairs ,first name of the metal of which the second is an ore.on the other hand ,solder is an alloy.