Question

mention two similarities between iron copper and aluminum

Answer 1

First of all the main similarity between iron, copper and aluminium is that they are metals

Secondly if these metals react with acid like H2SO4 the form metal oxide and liberate hydrogen gas.

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Answer 2

all the 3 are:
→metals
→lustrous
→good conductors of both electricity and of heat.
→sonorous
→Solid at room temperature