F.2 chem

1. zinc = b. It has fast reaction with strong acid and produce hydrogen.
2. copper = a. It has no reaction with hydrochloric acids.
3. Iron = c. It has slow reaction with acids.
Since in the reactivity series,
Zinc < Iron < Copper
that Zinc is the most reactivity,
so it reacts in the highest rate with acid.
Copper is the least reactivity,
so it has no reaction with acid.
Iron is the middle position,
so it reacts slowly with acid.
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